Multiple Scattering Effects in the Interplanetary Medium: Evaluation Using SOHO SWAN and MAVEN EUVM Lyman α Measurements

Eric Quémerais 1 Edward Thiemann 2 Martin Snow 2 Stéphane Ferron 3 Walter Schmidt 4
1 HEPPI - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
2 LASP - Laboratory for Atmospheric and Space Physics [Boulder]
3 ACRI-ST - Analytic and Computational Research, Inc. - Earth Sciences
4 FMI - Finnish Meteorological Institute
Abstract : Interplanetary background measurements can be used to derive the solar flux that is illuminating the atoms in the interplanetary medium. We present a new algorithm combining measurements from the SWAN‐SOHO Lyman α photometer with Earth‐based solar flux measurements to derive the solar illuminating flux at Lyman α in any direction along the ecliptic plane. The modulations of the solar flux and the interplanetary background intensity are proportional. The proportionality coefficient is a direct measurement of the fraction of the interplanetary brightness that is due to single scattering in the interplanetary medium. We find that for an observer at 1 AU from the Sun, single scattering photons represent roughly 70% of the total brightness. This new algorithm is tested by a comparison with actual measurements from the EUVM‐MAVEN solar monitor in orbit around Mars since 2014.
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Eric Quémerais, Edward Thiemann, Martin Snow, Stéphane Ferron, Walter Schmidt. Multiple Scattering Effects in the Interplanetary Medium: Evaluation Using SOHO SWAN and MAVEN EUVM Lyman α Measurements. Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 2019, 124 (6), pp.3949-3960. ⟨10.1029/2019JA026674⟩. ⟨insu-02151127⟩

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