Questions? Since 1978, various satellites have measured the Sun’s brightness above Earth’s atmosphere. Latitude:-90 90. Using the long-term and near-real time data products from the science projects above, Dr. Stackhouse leads several NASA-funded Applied Science projects that customize, these data products along with meteorological input, for the energy-related and agricultural industries. The instrument, the Total and Spectral Solar Irradiance Sensor (TSIS-1), is said to be capable of precisely measuring what researchers call “total solar irradiance”. Westberg, T. Zhang, S.K. Irradiance levels vary considerably at different times of the year, depending on the seasons, the weather and the time of day. Westberg, R. Perez, S. Wilcox, 2008: Chandler, William S., P.W. Brown, 2001: Surface meteorology and Solar Energy (SSE) Applications Project. The power absorption of the module is the maximum solar module Wattage divided by its surface area. A comprehensive solar calculator suite for providing a full analysis of your solar PV project, finding out solar irradiance for your location, calculating solar angles and make your solar design process as straight forward as possible. Application of the surface-based data in validation of the satellite-based GEWEX SRB radiation data products and POWER SSE data products; 3.) Solar Physics 214(1): 1-22 Published: January 26 2016 He leads the development and sustainment of the python-based POWER API, web services, and near real-time data processing. Solar irradiance is the rate at which radiant energy is incident on per unit area of the surface. Hoell, 2007: Hoell, James M., P.W. Stackhouse, P.W., Jr., R. Ganoe, D. Westberg, G.J. American Geophysical Society Annual Meeting, Fall 2012, December 3-7, San Francisco, CA, Stackhouse, P.W., Jr., W.S. Gupta, A.C. Wilber, A.C. Edwards, P.K. Meteor. The Americas Grouped parameters in each widget to organize parameters similar to the previous POWER websites and apps. Kratz, S.K. View a categorized list of POWER Publications. Different data sets were required to produce a long time series. Stackhouse, Jr., 2008: Zhang, Taiping., P.W. (2005). NASA Summer S'COOL 2002 Workshop, July 19-25, Hampton, Virginia, Whitlock, Charles H., P.W. General Atomics Electromagnetic Systems won a $32.9 million contract to build NASA’s Total and Spectral solar Irradiance-2 (TSIS-2) spacecraft, a small satellite scheduled to launch in 2023. The solar (also called solar-weighted) reflectance is a weighted average of the spectral reflectance over the solar λ range, with a standard solar spectral irradiance distribution as the weighting function. 172-240, Whitlock, C. H., and William S. Chandler, 1999: Integration of NASA's Satellite Weather Data and the RETScreen Model. Whitlock, W.S. Solar Irradiance. A study requested by the Earth Science Enterprise Applications Division, NASA Headquarters, August 9, Washington, D.C. Brown, Donald E. and W. S. Chandler, 2002: Surface Solar Energy. Solar azimuth angle Cosine of solar incidence angle on panel Cosine refraction corrected solar zenith angle Solar elevation (no atmospheric correction) Solar elevation angle (degrees from horizon, refracted) Extraterrestrial Global Horizontal Solar Irradiance (W/m 2) Extraterrestrial Direct Normal Solar Irradiance … NASA, 1998: Surface Solar Energy Measurements. Hoell, 2004: Chandler, William S., C.H. Added Minimum and Maximum Solar Irradiance for Equator Facing Tilted Surfaces available for the SSE Community. Chandler, J.M. Westberg, W. S. Chandler, A. J. Barnett, T. Zhang, 2015: A Global Agroclimatology Data Base: Thirty Plus Years of Satellite-Derived Solar Insolation and Assimilation Model Meteorological Parameters. Barnett, W.S. Whitlock, J.M. Stackhouse, Jr., 2005: Whitlock, Charles H., P.W. It is not recommended to use this time series data to assess trends across the breaks in dates listed below. A table of some of them is shown below. Hoell, D.J. Solar irradiance is a measure of the suns power. He has been working on the NASA GEWEX SRB and POWER projects since 2003 as a senior research scientist. Presented at the AMS Ninth Conference on Satellite Meteorology and Oceanography, May 25-29, Paris, France, Breeden, John, 1997: NASA aims to stamp out hunger with solar models. Solar Resource Data Sets. Chandler, J.M. Westberg, 2014: Application of a global-to-beam irradiance model to the NASA GEWEX SRB dataset: An extension of the NASA Surface meteorology and Solar Energy datasets. Stackhouse Jr., J. Barnett, T. Bristow, W. Chandler, J. Hoell, D. Westberg, T. Zhang, M. Tisdale, B. Tisdale and B. Quam, 2017: The Provision of NASA Satellite–based and Model Assimilation Data Products for ASHRAE. Chandler, J.M. Proceedings of SOLAR 98: Renewable Energy for the Americas, June 13-18, Albuquerque, New Mexico, sponsored by the American Solar Energy Society, the American Society of Mechanical Engineers, the American Institute of Architects, the U.S. Department of Energy, the Organization of American States, the University of New Mexico, NationsBank, the New Mexico Land Office, Public Service Company of New Mexico, and the New Mexico Energy Office, Whitlock, Charles H., 1998: Overview of NASA Data. Added additional solar and meteorological parameters. White, J.W., G. Hoogenboom, P. Stackhouse, Jr., and J. Hoell, 2006: Utility of NASA's daily solar and meteorological data for regional level modeling of wheat phenology and yield potential. Stackhouse, P.W., Jr., R. Birk, J. Kaye, C.H. Power From The Sun Chapter 2. Stackhouse, M.N. Added 2018 option to Start and End Dates for Interannual data. Leng, N. Meloche, K. Bourque, F. Sheriff, T. Anderson and J. Poirier, 2012: Stackhouse, Paul W., Jr., Robert Charles, William Chandler, David Westberg, James Hoell, Taiping Zhang, Urban Zeigler and Gregory J. Leng, Nathalie Meloche, Kevin Bourque, Farah Sheriff, Tommy Anderson and Julien Poirier, 2012: Using NASA Satellite and Reanalysis to Provide Climate Data Products for Energy Industry Applications. White, Jeffery W., G. Hoogenboom, P.W. They do not include local weather effects and so these theoretical graphs are not used in system sizing or prediction of operation. Available from NASA Headquarters, Washington, D.C. DiPasquale, Roberta C., 1998: NASA Data/Technical Support. He has a Masters of Agriculture from Iowa State University and was awarded a Bachelor of Science in Geography with an emphasis in Geographic Information Systems (GIS) from Old Dominion University along with a GIS certificate. Hoell, and J. Kusterer, 2015: Increasing Accessibility and Interoperability of NASA Data Products with GIS Tools. Bug fix for solar geometry updating the Cosine Solar Zenith Angle parameter. This irradiance has been measured by a variety of space-based instruments for the past 30 years. The spectral irradiance changes by almost a million while the wavelength changes by by 1000! Three models of the solar spectral irradiance. This solar calculator is provided for research and entertainment purposes only. Stackhouse, Jr, W.S. Nmsu Solar Time Angles And Irradiance Calculator User Manual. EVE will provide the solar data needed to drive the next generation of thermosphere/ionosphere models. This information can then be used to calculate the average daily power generation a solar electric system will produce in any given month. Chandler, D.J. Hoell, D.J. The Agroclimatology Archive is designed to provide web-based access to industry-friendly parameters formatted for input to crop models contained within agricultural DSS. Invited presentation at the workshop entitled 'Geospatial Statistics and Issues in Energy Modeling', The workshop was sponsored by EERE/NREL. Hoell, and T. Zhang, 2004: The NASA Prediction of Worldwide Energy Resource (POWER) Project. After 17 years in orbit, NASA’s Solar Radiation and Climate Experiment mission ended as planned on February 25, 2020. xmlns:xsl=''">. Leng, E. Teats, J. Hughes, R. DeYoung, M. Carroll, L. Liou, L. Iraci, J. Podolske, W. Stefanov, W.S. Barnett, W.S. Chandler, J.M. Welcome to the solar spectrum calculator. Westberg, J.M. Hoell, D. J. Westberg, T. Zhang, 2006: Stackhouse, Jr., Paul W., C.H. Jr, D.J. Whitlock, J.M. Proceedings of DOE 2nd Workshop on Satellites for Solar Energy Assessments, February 3-4, Golden, Colorado. Gupta, T. Zhang, W.S. Invited presentation at the workshop entitled 'Renewable Energy Modeling Series-Modeling Solar Energy Use', December 6, Washington, DC. (Webex), Stackhouse P.W., Jr., D. P. Kratz, S. K. Gupta, A. C. Wilber, T. Davenport, and L. Parker, 2015: Near-Real Time Surface Radiative Fluxes and Meteorology for Research and Applications, CERES Science Team Meeting, May 5-7, Hampton, Virginia, Tisdale, Brian, M. Tisdale, P.W. 2004 joint ASA-CSSA-SSSA International Annual Meetings, October 31-November 4, Seattle, Washington, Hoell, James M., Taiping Zhang, and Paul W. Stackhouse, Jr., 2004: Comparisons of Ground Observations and Satellite Based Estimates of Surface Solar Radiation. Whitlock, G.J. This solar irradiance calculator shows you how much power you get from the sun at your location on an average day for every month of the year. View a list of Frequently Asked Questions. DiPasquale, W.S. I have the information on latitude, longitude, cloud cover, solar zenith angle and wind speed. The solar irradiance is the output of light energy from the entire disk of the Sun, measured at the Earth. NASA's Total and Spectral Solar Irradiance Sensor – 2, or TSIS-2, will measure the Sun's energy input to Earth. Hoell, D.J. A new, lower value of total solar irradiance: Evidence and climate significance Kopp, G., and J. Chandler, D.J. In the presence of clouds the ability to calculate instantaneous spectral irradiance values is limited by the ability to acquire appropriate input parameters for radiative transfer solvers. Hoell, and W.S. Stackhouse Jr., Paul W., A. J. Barnett, 2015: Expanding NASA's Surface meteorology and Solar Energy (SSE) Data Access and Analysis Capabilities, GEO XII - AIP 8 Results Session, November 10, Mexico City, Mexico (Webex) - (due to technical issue at the conference, the talk recorded and posted on GEO web site), Stackhouse Jr., Paul W., A. J. Barnett, 2015: Energy Related Applied Science Projects using NASA's POWER/SSE Web Applications, GEO XII - AIP 8 User Session, November 10, Mexico City, Mexico (Webex), Stackhouse Jr., Paul W., A. J. Barnett, 2015: Expanding NASA's Surface meteorology and Solar Energy (SSE) Data Access and Analysis Capabilities, AIP 8 Deep Dive Session, October 20. Stackhouse, Jr., L.M. Hoell, T. Zhang, 2010: Whitlock, Charles H., P.W. (2006). TSIS-2 will add solar irradiance measurements to four decades of continuous data records. Bull. He is a science team member of the Clouds and Earth Radiant Energy System (CERES) project and co-leads the FLASHFlux (Fast Longwave and Shortwave radiative Fluxes) working group that produces low latency estimates of top-of-atmosphere and surface radiation data products from CERES. If you have any questions please do not hesitate to contact the POWER team. Chandler, J.M. Solar Irradiance Updated and Max and Min Added, Added documentation for How To Access Data and How To Find My Parameters, Added SSE Announcement Decommission Letter. Taiping Zhang has a Master of Science from Tianjin University (1987) and a Ph.D. from Yale University (2003). All spectral variations are derived from the NRLSSI models from Dr. Judith Lean ( and Ph.D. in Atmospheric Sciences at Colorado State University in 1989 and 1995 respectively. Smith, G.P. POWER data access appears to be temporarily unavailable. Chandler, and D.E. Chandler, William S., P.W. Stackhouse Jr., L.M. This photoelectric effect won Einstein the Nobel Prize in 1921. Hoell, D.J. Invited presentation at workshop entitled 'Satellites for Solar Energy Resource Information', April 10-11, Washington, D.C. sponsored by the U.S. Department of Energy and the New York State Energy Research and Development Authority. Cox, T. Zhang, R. Perez, W.S. ASES National Solar Conference, San Francisco, CA, 10-13 July, 2016 . Westberg, T. Zhang, P.W. Amer. FirstGov - Your First Click to the US Government + NASA Privacy Statement, Disclaimer, and Accessibility Certification | NASA - National Aeronautics and Space Administration | Page Curator: POWER Project Team | NASA Official: Paul Stackhouse | Contact NASA | Last modified 02/25/2020. Stackhouse Jr., J. Barnett, T. Bristow, W. Chandler, J. Hoell, D. Westberg, T. Zhang, M. Tisdale, B. Tisdale and B. Quam, 2017: A revitalized GIS-enabled NASA POWER web site with featuring updated data parameters, expanded data accessibility, and analysis functionality for the renewable energy and other applications. Earth's Energy Budget Remained Out of Balance Despite Unusually Low Solar Activity. Interagency Forum on Climate Change, NASA Climate Adaptation Science Investigator Team (CASI), Washington, DC., Sept. 21. Whitlock, W.S. Hoell, D.J. Chandler, J. M. Hoell, D. J. Westberg, T. Zhang, S. Gupta, P.W. She has a master’s degree in meteorology from Pennsylvania State University and a Bachelor of Science in meteorology from Florida State University. Paul W. Stackhouse Jr., D. J. Westberg, J. M. Hoell, A. J. Barnett, T. Bristow, and D. Crawley. of data products that we have distributed. These derived data sets are provided below as geospatial rasters. Presented at the CERES Science Team Meeting, January 23-26, Williamsburg, Virginia, Whitlock, Charles H., A. Racel, and N. Silvers, 1998: Invited NASA briefing for ambassadors and their staffs from 7 African countries. Alternative Climate Normals and Impacts to the Energy Industry, April 24-25, Asheville, North Carolina. The Langley DAAC Newsletter, Summer 1997, Whitlock, Charles. The total solar irradiance (TSI), improperly called “solar constant” until a few years ago, has been found to change about 0.1% in an 11-year solar sunspot activity. Over 50 different global datasets are represented with daily, weekly, and monthly snapshots, and images are available in a variety of formats. Updates to the POWER Homepage and added the new POWER Docs. Hoell, D. Westberg, T. Zhang, 2007: NASA's Surface Meteorology and Solar Energy Web Portal (Release 6.0). American Meteorological Society 98th Annual Meeting 2018, 7-11 January 2018. Hoell, D. Westberg, T. Zhang, 2010: Anderbuerg, M., D. Renne, T. Stoffel, M. Sengupta, R. Perez and P.W. Stackhouse, Jr., W.S. Stackhouse, Jr., A.J. Business Africa, August 3-4, Indianapolis, Indiana, sponsored by four U.S. government or state agencies. Stackhouse, Jr., 2006: Stackhouse, P.W., Jr., 2005: GOESS (Global Earth Observation System of Systems): Current Synopsis, Overview, and potential by the IEA (International Energy Agency) Task 'Solar Resource Knowledge Management'. Hoell, W.S. Extraterrestrial Direct Normal Solar Irradiance (W/m 2) Extraterrestrial Global Irradiance on a tilted surface (W/m 2) Sunrise time, minutes from midnight (local w/o refraction) Sunset time, minutes from midnight (local w/o refraction) Shadow-band correction factor Factor that normalizes Kt, Kn, etc. Higher still ultraviolet light creates the thermosphere, which is ionized by light at the short wavelengths of the extreme ultraviolet (EUV). Stackhouse, Jr., 2006: Supporting Energy-Related Societal Applications Using NASA's Satellite and Modeling Data. Model C from that dataset is used in this study. 103(4), pp. Measuring the spectral irradiance is important because different wavelengths (or colors) of sunlight are absorbed in different parts of our atmosphere. Hoell, D. Westberg, T. Zhang, 2007: Hoell, James M., Paul W. Stackhouse, Jr., Richard Eckman, 2006: Rapid Prototyping of NASA's Solar and Meteorological Data For Regional Level Modeling of Agricultural and Bio-fuel Crop Phenology and Yield Potential. Zhang, Yabei, S.J. At NASA Langley Research Center, he is lead scientist of the NASA/Global Energy and Water Cycle Experiment (GEWEX) Surface Radiation Budget (SRB) Project, a project responsible to use satellite and other analysis to estimate the long-term surface radiation budget and components. Both data sets in Figure 1 exhibit a solar cycle variation in which maximum irradiance coincides with maximum solar activity. As the Earth moves around the sun, the fact that the Earth's axis is tilted means that the sun's overhead position moves from the Northern Hemisphere to the Southern Hemisphere and back from one summer to the next. RETScreen Network Planning Meeting, June 19-20, Val Morin, Canada, DiPasquale, R. C. and W. S. Chandler, 2001: Surface Solar Energy. Chandler, T. Zhang, D.P. Agronomy Journal, Vol. Photons that carry this energy have wavelengths from energetic X-rays and gamma rays to visible light to the infrared and radio. DiPasquale, and C. H. Whitlock, 2002: Whitlock, C. H., D. E. Brown, W.S. Barnett, J.M. Chandler, William S., C.H. Kyle, P.W. Stackhouse, Jr., 2006: Whitlock, Charles H., W.S. We feel warm because of the visible and infrared radiation that reaches the surface. Stackhouse, Paul W., Jr., Patrick Minnis , Richard Perez , and et al., 2016 : Stackhouse, P.W. It can be measured for any glowing object, including stars, the Moon, and the overly bright high beams of an oncoming car. Global Modeling and Assimiliation Office (GMAO), NASA/GEWEX Surface Radiation Budget (SRB) Project, CERES Fast Longwave And SHortwave Radiative Fluxes (FLASHFlux), An Assessment of New Satellite Data Products for the Development of a Long-term Global Solar Resource at 10-100 km, Enhancing the NASA Prediction Of Worldwide Energy Resource Web Data Delivery System with Geographic Information System (GIS) Capabilities, NASA Prediction of Worldwide Energy Resource High Resolution Meteorology Data For Sustainable Building Design, Progress towards deriving an improved long-term global solar resource, Usage of NASA's Near Real-time Solar and Meteorological Data for Monitoring Building Energy Systems Using RETScreen International's Performance Analysis Module, CEOS Contributions to Informing Energy Management and Policy Decision Making Using Space-Based Earth Observations, NASA's Prediction of Worldwide Energy Resource (POWER) Web Services, The assessment and use of 1-Degree Gridded TOA and surface radiative flux products from CERES FLASHFlux for science and applications, Near Real-time Global Radiation and Meteorology Web Services Available from NASA, Using NASA Satellite and Model Analysis for Renewable Energy and Energy Efficiency Applications, Evaluation of NASA satellite- and assimilation model-derived long-term daily temperature data over the continental US, Satellite Based Assessment of the NSRDB Site Irradiances and Time Series from NASA and SUNY/Albany Algorithms, Decadal Differences in Satellite Derived Solar and Meteorological Parameters, Application of Satellite Sensor Data and Models for Energy Management, Usability of NASA Satellite Imagery-Based Daily Solar Radiation for Crop Yield Simulation and Management Decisions, Climatological to Near Real Time Global Meteorological Data for Agricultural, Range, and Forestry Applications, A Global Perspective on Renewable Energy Resources: NASA's Prediction of Worldwide Energy Resources (POWER) Project, Completing Production of the Updated National Solar Radiation Database for the United States, Evaluation of PV Generation Capacity Credit Forecast on Day-Ahead Utility Markets, Enhancing the Geographical and Time Resolution of NASA SSE Time Series Using Microstructure Patterning, Clear-sky Shortwave Surface Radiation Intensities over the Globe, NASA's Support of Integrated Renewable Energy Systems through Provision of Solar and Meteorological Resource Information, Global Solar and Meteorological Data for Agricultural Applications, Towards Designing an Integrated Earth Observation System for the Provision of Solar Energy Resource and Assessment, Supporting Energy-Related Societal Applications Using NASA's Satellite and Modeling Data, Towards Production of an Updated National Solar Radiation Data Base, Inter-Comparison of Solar Resource Data Sets: NASA-SRB/SSE versus DLR-ISIS Global and Beam Irradiance, Solar Resource Knowledge Management: A New Task of the International Energy Agency, Independent Validation of NDFD-Based Solar Radiation Forecasts, Deriving Long Term High Resolution Solar Irradiances from Low Resolution Archives via Microstructure Patterning, New Renewable Energy Prototype Data Sets from NASA Satellites and Research, NASA Solar and Meteorological Data for Sustainable Buildings, Results of Solar Resource Assessments in the UNEP/SWERA Project, Progress on an Updated National Solar Radiation Data Base for the United States, Parameters for Designing Back-Up Equipment for Solar Energy Systems, Determining Wind Resources as a Function of Surface Roughness and Height from NASA Global Assimilation Analysis, Renewable Energy Applications from NASA Satellite Analysis and Modeling, Renewable Energy Data Sets from NASA Satellites and Research, NASA Climatological Data for Renewable Energy Assessment, Solar Renewable Energy Data Sets from NASA Satellites and Research, Progress on Updating the 1961-1990 National Solar Radiation Data Base, Energy Design Software using NASA Meteorology and Solar Energy Data, Variability of Diffuse Solar Surface Radiation over the Globe, NASA Global Meteorology and Solar Energy Used in Design Software, Development of an Architectural Data Set from Satellite Data, Overview of the Surface meteorology and Solar Energy (SSE) Project: An Innovative Web-Based Data Set for the Renewable Energy Industry, A Satellite-Derived Global Climatological Data Set for the Renewable Energy Industry, Global Surface Solar Energy Anomalies Including El Nino and La Nina Years, Global Solar Energy Anomalies Including El Nino and La Nina Years, Comparison of Measured Direct Normal Radiation to Estimates Modeled From Satellite Data, Overview of a Satellite-derived global Climatological Data Set for Solar and Wind Energy Resource Assessment, NASA/SAIC Project: Climatic Data Sets for Architectural Applications, NASA Surface Solar Energy Data Sets for Commercial Applications, Release 3 NASA Surface Meteorology and Solar Energy Data Set For Renewable Energy Industry Use, NASA Surface Insolation and Meteorology Data for Renewable Energy Use, An Advanced Web Site of Satellite-Derived, Solar Resource Data for the Globe, Estimates of Briggs et al. Hoell, T. Zhang, D. Westberg, R. Perez, C. Hemker, J. Schlemmer, D. Renne, M. Sengupta, 2011: Towards an Improved High Resolution Global Long-term Solar Resource Database. Whitlock, P.W. The user sets the location and orientation of the module, the time of day and year, and the atmospheric conditions for cloudless skies (e.g., preciptiable water vapour, ozone, turbidity). Budget (ERB)~ experiment on the Nimbus 7 satellite were obtained from NASA's Climate Data System (NCDS) on 16 June 1989 and 21 Feb 1990, respectively. The EUV irradiance is absorbed by the atmosphere at altitudes above 100 km. This effect causes winters to be cold and summers warm in the … Solar Energy, Vol. International Union of Geodesy and Geophysics 2007 XXIV General Assembly, July 2-13, Perugia, Italy. Cox and T. Zhang, R. Perez, J. Schlemmer, M. Sengupta and K. Knapp, 2014: Establishing a Long-term 30 Year Global Solar Resource at 10 km Resolution: Preliminary Results From Test Processing and Continuing Plans, 29th European PV Solar Energy Conference and Exhibition (EU PVSEC 2014), September 22-26, Amsterdam, Netherlands, Zhang, Taiping, P.W. Proceedings of EnviroInfo 2007, O. Hryniewicz, J. Studzinski, M. Romaniuk (Eds), Shaker Verlag, Vol. Solcast - Solar Irradiance Data Solcast - Solar Irradiance Data Solcast offers global coverage of historical (up to 15y), recent (past 3 months) and live (past 7 days) solar irradiance … Whitlock, T. Zhang, 2007: Zhang,Taiping, P.W. Stackhouse, Jr., T. Zhang, 2006: Renne, Dave, R. George, B. Marion, R. Perez, C. Schilling, F. Treib, R. Meyer, E. Pereira, F. Martins, P. Stackhouse, M. Vipradas, and C. Gueymard, 2005: Wilcox, Steve, R. Perez, R. George, W. Marion, D. Meyers, D. Renne, A. DeGaetano, C. Gueymard, F. Vignola, P.W. and P.W. Whitlock and W.S. Added additional solar geometry and tilt parameters. Stackhouse, Jr., 2010: Evaluating Solar Resource Variability from Satellite and Ground-based Observations. Gupta, A.C. Wilber, P. Sawaengphokhai, A.C. Edwards, D. Westberg, E. Zell, G. Leng, 2010: Near Real Time Surface Solar Radiation and Meteorological Parameters From the CERES FLASHFlux Project: Examples of Usage for Energy-Related Applications. H. and Dan Tarpley, 1996: Satellite-Based Solar Radiation Data Archives and New Data. Hoell, 2011: Evaluation of Satellite-Based, Modeled-Derived Daily Solar Radiation Data for the Continental United States. Hoell, D.Westberg, C.H. Chandler, 2004: Contributions to Solar Energy Resource Information from NASA Satellites and Modeling. Register to our newsletter and be updated with the latest information regarding our data and services. Energy from other sources also enters our atmosphere. Solar Irradiance Changes and the Sunspot Cycle 27 Irradiance (also called insolation) is a measure of the amount of sunlight power that falls upon one square meter of exposed surface, usually measured at the 'top' of Earth's atmosphere. Westberg, David J., P.W. Westberg, T. Zhang, S. Gupta, P.W. Calculating solar irradiance over time, or the average amount of energy your solar system may generate per day. Crawley, J.M. Chandler, J.M. But, although TSI varies by only a fraction of a percent, it has the greatest magnitude of change (~1.2 W/m2). Proceedings of the Solar 2010 Conference (American Solar Energy Society), May 18-22, Phoenix, Arizona. Nmsu Solar Time Angles And Irradiance Calculator User Manual . Proceedings of DOE 2nd Workshop on Satellites for Solar Energy Assessments, February 3-4, Golden, Colorado, Stackhouse, Paul, 1999: Satellites and Sensors: Satellite Missions Impacting the Estimation of Solar Irradiance. Wilkens, P.W. Hit the "Calculate Solar Position" button. 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