Photoelectrons Escaping the Ionosphere During the WHI: An Alternative Method to Validate the Temporal and Spectral Variation of the Solar Irradiance in the 1-50 nm Range.

Physics

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1650 Solar Variability (7537), 2479 Solar Radiation And Cosmic Ray Effects, 7536 Solar Activity Cycle (2162), 7538 Solar Irradiance, 7974 Solar Effects

Scientific paper

We report observations of 10 eV to 1 keV photoelectrons produced by 1-50 nm solar irradiance during the Whole Heliosphere Interval (WHI). The observations were made from the FAST satellite at ~ 3,000 km. From March 20 to April 16, 2008 we found minimal (ie ~10%) variation in photoelectron flux at 25 eV, generated by EUV irradiance in the 27-31 nm range and large (i.e. >200%) variation in the photoelectron flux at 360 ev, generated by EUV irradiance in the 3 nm range. These variations are comparable to those found under more active solar conditions. We also compared the average photoelectron spectrum observed on April 14 with the solar irradiance observed from a rocket carrying a prototype of the SDO/EVE instrument on that day. The comparison was made using photoelectron fluxes calculated from the Field Line Interhemispheric Plasma (FLIP) code with the rocket spectrum as input. We found that the observed and calculated photoelectron spectra agree within 30% over all energies. This is a significant improvement from previous comparisons.

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