Solar EUV Variability as Measured by SOHO/EIT: Comparison to SOHO SEM and He II 304, Case Studies

Details Solar EUV Variability as Measured by SOHO/EIT: Comparison to SOHO SEM and He II 304, Case Studies Solar EUV Variability as Measured by SOHO/EIT: Comparison to SOHO SEM and He II 304, Case Studies

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp32b06n&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP32B-06

Physics

2479 Solar Radiation And Cosmic Ray Effects, 7536 Solar Activity Cycle (2162), 7538 Solar Irradiance

Scientific paper

The specification of soft X-ray and EUV solar flux is important because it is the main ionizing source for the ionosphere and the EUV energy deposit is primarily responsible for the structure and dynamics of the thermosphere. The EIT instrument aboard SOHO obtains full disk images of the Sun through four channels at Fe IX,X (171 A), Fe XII (195 A), Fe XV (284 A), and He II (304 A). We construct a model differential emission measure (DEM) map, using calibrated SOHO EIT images from the four channels which accurately covers the temperature range 80,000 - 2.2 MK. We use the DEM map to calculate absolutely calibrated images of individual lines or passbands in addition to the four EIT channels. As a case study of the power of this technique we present a long term comparision (1996-2000) to the SOHO SEM instrument full disk irradiances. Additionally we produce a pure He II (304 A) solar irradiance for the entire SOHO EIT mission. This irradiance, covering a large part of a solar cycle can provide a fundamental parameter to compare with Earth's atmospheric variations.

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