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The Martian bow shock over solar cycle 23‐24 as observed by the Mars Express mission

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journal contribution
posted on 29.05.2019, 14:52 by B Hall, B Sanchez-Cano, W James, M Lester, M Holmstrom
The Martian bow shock position is known to be correlated with solar extreme ultraviolet (EUV) irradiance. Since this parameter is also correlated with the evolution of the solar cycle, it is expected the Martian bow shock position should also vary over such a period. However, previous reports on this topic have often proved contradictory. Using 13 years of observations of the Martian bow shock by the Mars Express mission over the period 2004 to 2017, we report that the Martian bow shock position does vary over the solar cycle. Over this period our analysis shows the bow shock position to increase on average by 7% between the solar minimum and maximum phases of solar cycle 23‐24, which could be even larger for more extreme previous solar cycles. We show that both annual and solar cycle variations play major roles in the location of the bow shock at Mars.

Funding

BESH acknowledges previous support through STFC grant ST/K502121/1 and also through ST/M001059/1, JW also from STFC grant ST/M001059/1, ML and BS‐C through STFC grant ST/N000749/1. The Swedish contribution to the ASPERA‐3 experiment is supported by funding from the Swedish National Space Agency (SNSA). The MEX ASPERA‐3 datasets are hosted on the European Space Agency's Planetary Science Archive, and we thank the mission/instrument PIs, and the database managers for their support of the MEX mission. The derived bow shock crossing list in this study is hosted and available from the Lancaster University Research Directory with DOI: https://doi.org/10.17635/lancaster/researchdata/285. The TIMED‐SEE data was downloaded from the University of Colorado’s website (http://lasp.colorado.edu/lisird/index.html) and we thank the PIs for access to this dataset. The OMNI 2 dataset are available on the GSFC/SPDF OMNIWeb platform (http://cdaweb.gsfc.nasa.gov/) and we are grateful to the PIs for the creation and maintenance of this vast dataset. The authors thank the Mars Upper Atmosphere Network led by Hermann J. Opgenoorth for rich discussions at their semi‐annual meetings. BESH, whom has since left academia to pursue other ventures, would personally like to thank the hard work, commitment, and leadership of BS‐C as they took ownership of this publication throughout the review process enabling it to reach its final publishable state.

History

Citation

Journal of Geophysical Research: Space Physics, 2019

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

AM (Accepted Manuscript)

Published in

Journal of Geophysical Research: Space Physics

Publisher

American Geophysical Union (AGU), Wiley

issn

2169-9402

Acceptance date

03/05/2019

Copyright date

2019

Available date

29/05/2019

Publisher version

https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JA026404

Language

en

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