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Sunspot Numbers from ISOON: A Ten-Year Data Analysis
Published in Springer Netherlands
Volume: 291
Issue: 9-10
Pages: 3123 - 3138
Sunspot numbers are important tracers of historical solar activity. They are important in predicting the oncoming solar maximum, in the design of lifetimes of space assets, and in assessing the extent of solar-radiation impact on the space environment. Historically, sunspot numbers have been obtained visually from sunspot drawings. The availability of digital images from the US Air Force Improved Solar Optical Observing Network (ISOON) prototype telescope concurrent to observer-dependent sunspot numbers recorded at the National Solar Observatory (NSO) has provided a basis for comparing sunspot numbers determined from the two methods. We compare sunspot numbers from visual and digital methods observed nearly simultaneously. The advantages of digital imagery are illustrated. © 2016, Springer Science+Business Media Dordrecht (outside the USA).
About the journal
JournalData powered by TypesetSolar Physics
PublisherData powered by TypesetSpringer Netherlands
Open AccessNo