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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [27 references]  Display  Hide  Download
https://hal-insu.archives-ouvertes.fr/insu-02151127
Contributor : Catherine Cardon <>
Submitted on : Wednesday, September 11, 2019 - 5:58:49 PM
Last modification on : Wednesday, September 11, 2019 - 6:18:43 PM

File

Qu-merais_et_al-2019-Journal_o...
Publication funded by an institution

Identifiers

Collections

INSU | LATMOS | UVSQ | SORBONNE-UNIVERSITE | SU-SCIENCES | UNIV-PARIS-SACLAY

Citation

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⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

86

Files downloads

23

Contact

CCSD