Lyman-α Models for LRO LAMP from MESSENGER MASCS and SOHO SWAN Data

  • Wayne R. Pryor
  • Gregory M. Holsclaw
  • William E. McClintock
  • Martin Snow
  • Ronald J. VervackJr.
  • G. Randall Gladstone
  • S. Alan Stern
  • Kurt D. Retherford
  • Paul F. Miles
Chapter
Part of the ISSI Scientific Report Series book series (ISSI, volume 13)

Abstract

From models of the interplanetary Lyman-α glow derived from observations by the Mercury Atmospheric and Surface Composition Spectrometer (MASCS) interplanetary Lyman-α data obtained in 2009–2011 on the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft mission, daily all-sky Lyman-α maps were generated for use by the Lunar Reconnaissance Orbiter (LRO) LAMP Lyman-Alpha Mapping Project (LAMP) experiment. These models were then compared with Solar and Heliospheric Observatory (SOHO) Solar Wind ANistropy (SWAN) Lyman-α maps when available. Although the empirical agreement across the sky between the scaled model and the SWAN maps is adequate for LAMP mapping purposes, the model brightness values best agree with the SWAN values in 2008 and 2009. SWAN’s observations show a systematic decline in 2010 and 2011 relative to the model. It is not clear if the decline represents a failure of the model or a decline in sensitivity in SWAN in 2010 and 2011. MESSENGER MASCS and SOHO SWAN Lyman-α calibrations systematically differ in comparison with the model, with MASCS reporting Lyman-α values some 30 % lower than SWAN.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Wayne R. Pryor
    • 1
    • 2
  • Gregory M. Holsclaw
    • 3
  • William E. McClintock
    • 3
  • Martin Snow
    • 3
  • Ronald J. VervackJr.
    • 4
  • G. Randall Gladstone
    • 5
  • S. Alan Stern
    • 6
  • Kurt D. Retherford
    • 5
  • Paul F. Miles
    • 5
  1. 1.Central Arizona CollegeCoolidgeUSA
  2. 2.LASP, University of Colorado and Space Environment TechnologiesPalisadesUSA
  3. 3.Laboratory for Atmospheric and Space PhysicsUniversity of ColoradoBoulderUSA
  4. 4.Applied Physics LaboratoryThe Johns Hopkins UniversityLaurelUSA
  5. 5.Southwest Research InstituteSan AntonioUSA
  6. 6.Southwest Research InstituteBoulderUSA

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