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Atmospheric erosion of Venus during stormy space weather
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2011 (English)In: Journal of Geophysical Research, ISSN 0148-0227, Vol. 116, A09308- p.Article in journal (Refereed) Published
Abstract [en]

We study atmospheric escape from Venus during solar minimum conditions when 147 corotating interaction regions (CIRs) and interplanetary coronal mass ejections (ICMEs) combined impact on the planet. This is the largest study to date of the effects of stormy space weather on Venus and we show for the first time statistically that the atmosphere of Venus is significantly affected by CIRs and ICMEs. When such events impact on Venus, as observed by the ACE and Venus Express satellites, the escape rate of Venus's ionosphere is measured to increase by a factor of 1.9, on average, compared to quiet solar wind times. However, the increase in escape flux during impacts can occasionally be significantly larger by orders of magnitude. Taking into account the occurrence rate of such events we find that roughly half (51%) of the outflow occurs during stormy space weather. Furthermore, we particularly discuss the importance of the increased solar wind dynamic pressure as well as the polarity change of the interplanetary magnetic field (IMF) in terms of causing the increase escape rate. The IMF polarity change across a CIR/ICME could cause dayside magnetic reconnection processes to occur in the induced magnetosphere of Venus, which would add to the erosion through associated particle acceleration.

Place, publisher, year, edition, pages
2011. Vol. 116, A09308- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-160155DOI: 10.1029/2011JA016749ISI: 000295133700003OAI: oai:DiVA.org:uu-160155DiVA: diva2:448483
Available from: 2011-10-17 Created: 2011-10-17 Last updated: 2011-10-17Bibliographically approved

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