Oxygen Ion Escape from Venus is Modulated by Ultra-Low-Frequency Waves

Riku Järvinen*, Markku Alho, Esa Kallio, Tuija Pulkkinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

We study the solar wind-driven, nonthermal escape of O+ ions from Venus in a global hybrid simulation. In the model, a well-developed ion foreshock forms ahead of the Venusian quasi-parallel bow shock under nominal upstream conditions. Large-scale magnetosonic ultra-low frequency (ULF) waves at 20- to 30-s period are excited and convect downstream along the foreshock with the solar wind. We show that the foreshock ULF waves transmit through the bow shock in the downstream region and interact with the planetary ion acceleration, causing 25% peak-to-peak fluctuations in the O+ escape rate. These results demonstrate the importance of upstream plasma waves on the energization and escape of heavy ions from the planetary atmospheres.
Original languageEnglish
Article numbere2020GL087462
Number of pages9
JournalGeophysical Research Letters
Volume47
Issue number11
DOIs
Publication statusPublished - 16 Jun 2020
MoE publication typeA1 Journal article-refereed

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