Solar Rotation Effects on the Thermospheres of Mars and Earth-Reference-Cited by-同舟云学术

Solar Rotation Effects on the Thermospheres of Mars and Earth

Published:2006-06-02 Issue:5778 Volume:312 Page:1366-1368
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Forbes Jeffrey M.¹²³,Bruinsma Sean¹²³,Lemoine Frank G.¹²³

Affiliation:

1. Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309, USA.

2. Department of Terrestrial and Planetary Geodesy, CNES, 31401 Toulouse, France.

3. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.

Abstract

The responses of Earth's and Mars' thermospheres to the quasi-periodic (27-day) variation of solar flux due to solar rotation were measured contemporaneously, revealing that this response is twice as large for Earth as for Mars. Per typical 20-unit change in 10.7-centimeter radio flux (used as a proxy for extreme ultraviolet flux) reaching each planet, we found temperature changes of 42.0 ± 8.0 kelvin and 19.2 ± 3.6 kelvin for Earth and Mars, respectively. Existing data for Venus indicate values of 3.6 ± 0.6 kelvin. Our observational result constrains comparative planetary thermosphere simulations and may help resolve existing uncertainties in thermal balance processes, particularly CO 2 cooling.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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