Extreme Ultraviolet Variability of the Large Solar Flare on April 21, 2002 and the Terrestrial Photoelectron Response

Details Extreme Ultraviolet Variability of the Large Solar Flare on April 21, 2002 and the Terrestrial Photoelectron Response Extreme Ultraviolet Variability of the Large Solar Flare on April 21, 2002 and the Terrestrial Photoelectron Response

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21b0431e&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA21B-0431

Physics

0358 Thermosphere: Energy Deposition, 2479 Solar Radiation And Cosmic Ray Effects, 7519 Flares, 7538 Solar Irradiance, 7549 Ultraviolet Emissions

Scientific paper

The near-simultaneous observations of the solar extreme ultraviolet (EUV) irradiance and terrestrial photoelectron distribution during and after the large solar flare on April 21, 2002 provide for a distinctive study of the effects that a solar flare can have on Earth's upper atmosphere. The solar EUV irradiance from 0.1-195 nm was measured by the Solar EUV Experiment (SEE) aboard the NASA Thermosphere, Ionosphere, Mesosphere, Energetics, and Dynamics (TIMED) satellite. The terrestrial photoelectron distribution from 50-1000 eV was measured by the Fast Auroral Snapshot (FAST) energetic electron sensor. The variations of the solar EUV irradiance from the X class flare at ~2 UT on April 21, 2002 range from more than a factor of 8 for the X-ray emissions to less than 10% at longer EUV wavelengths. The spectral shape of this flare is similar to that predicted for the Bastille Day 2000 flare. Most of the solar irradiance variation is in the X-ray range and for coronal emissions. The photoelectron distribution changed by a factor of about 10 for the high-energy Auger electrons and by very little for the low-energy thermal electrons. Modeling of the photoelectron distribution using the measured solar EUV irradiance will also be presented.

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