Measurements of the solar soft x-ray irradiance from the Student Nitric Oxide Explorer

Details Measurements of the solar soft x-ray irradiance from the Student Nitric Oxide Explorer Measurements of the solar soft x-ray irradiance from the Student Nitric Oxide Explorer

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1255b&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 9, p. 1255-1258

Astronomy and Astrophysics

Astrophysics

15

Atmospheric Composition And Structure: Thermosphere-Energy Deposition, Solar Physics, Astrophysics, And Astronomy: Solar Irradiance, Atmospheric Composition And Structure: Middle Atmosphere-Energy Deposition, And Astronomy: X Rays, Gamma Rays, And Neutrinos

Scientific paper

Beginning on March 11, 1998, the Student Nitric Oxide Explorer (SNOE) satellite has made daily observations of the solar soft x-ray irradiance. These measurements are carried out by a multi-channel photometer system utilizing x-ray sensitive photodiodes with individual thin film filters. Current from the photodiodes is analyzed in terms of a solar reference spectrum in order to determine solar irradiances. The irradiances from 2 to 10 nm vary between 0.15 and 0.40 ergs cm-2s-1 from March 11 to July 19, 1998 while the solar 10.7 cm fluxes varied between 85 and 140×10-22Wm-2Hz-1. A 27-day periodicity is observed with variations in the soft x-ray irradiance on the order of a factor of two. The measured irradiances are shown to be correlated with the solar 10.7 cm flux but only mildly so with the GOES-8 0.1 to 0.8 nm solar fluxes.

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