Trends in solar UV and EUV irradiance: An update to the MgII Index and a comparison of proxies and data to evaluate trends of the last 11-year solar cycle

Details Trends in solar UV and EUV irradiance: An update to the MgII Index and a comparison of proxies and data to evaluate trends of the last 11-year solar cycle Trends in solar UV and EUV irradiance: An update to the MgII Index and a comparison of proxies and data to evaluate trends of the last 11-year solar cycle

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmgc21b0877v&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #GC21B-0877

Astronomy and Astrophysics

Astrophysics

1

[2479] Ionosphere / Solar Radiation And Cosmic Ray Effects, [7538] Solar Physics, Astrophysics, And Astronomy / Solar Irradiance

Scientific paper

Long records of solar spectral irradiance are quite rare and differentiating between solar variability and instrumental changes can be a challenge. Proxies for solar irradiance have provided independent measures of solar variability and can be used to extend the data record beyond the observation period and to help differentiate solar variability from instrument drifts. Recently however there are indications that the relationships, that have remained relatively constant over the last several solar cycles, have changed significantly during this recent cycle. There are increasing divergences between the proxies and the observed irradiances. This divergence may indicate a fundamental change in the sun itself. We will present an update to the MgII composite index which is used a proxy for solar EUV, UV, and total irradiances. We will examine this recent solar minimum period and compare the MgII and other proxies to each other and to the EUV, UV, and TSI in an effort to better understand the past, present, and future solar spectral irradiance records.

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