Statistics – Methodology
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11607311t&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A7, CiteID A07311
Statistics
Methodology
Ionosphere: Ionosphere/Atmosphere Interactions (0335), Ionosphere: Planetary Ionospheres (5435, 5729, 6026), Ionosphere: Solar Radiation And Cosmic Ray Effects, Planetary Sciences: Solid Surface Planets: Ionospheres (2459), Planetary Sciences: Solid Surface Planets: Rings And Dust
Scientific paper
A statistical survey of dayside photoelectrons in the Mars upper ionosphere is presented and discussed. A methodology for isolating photoelectron spectra on strong crustal field lines is developed and used to obtain a database of over 280,000 distributions from the Mars Global Surveyor (MGS) electron reflectometer instrument. The relationship of these electron fluxes to various controlling factors is explored and presented. It is found that much of the flux variation can be explained by a linear fit with the EUV solar radiation proxy, adjusted for the Sun-Mars distance and local solar zenith angle. The state of the lower atmosphere seems to also play a critical role in the photoelectron flux intensity. An interval with a global dust storm shows an increased flux and steepened slope for the relationship with EUV radiation. This implies that the dust storm is altering the density, composition, and/or temperature of the photoelectron source region within the thermosphere and perhaps even the characteristics of the Mars exosphere above the MGS orbit. Other parameters considered had either no influence or a small perturbation compared to this dominant trend.
Frank Jacki
Liemohn Mike
Mitchell David
Trantham Matthew
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