English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Ablation of Venusian oxygen ions by unshocked solar wind

Wei, Y., Fränz, M., Dubinin, E. M., Wan, W., Zhang, T., Rong, Z., et al. (2017). Ablation of Venusian oxygen ions by unshocked solar wind. Science Bulletin, 62(24), 1669-1672. doi:10.1016/j.scib.2017.11.006.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0001-41AB-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-41AC-4
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Wei, Yong, Author
Fränz, Markus1, Author              
Dubinin, E. M.1, Author              
Wan, Weixing, Author
Zhang, Tielong, Author
Rong, Zhaojin, Author
Chai, Lihui, Author
Zhong, Jun, Author
Zhu, Rixiang, Author
Futaana, Yoshifumi, Author
Barabash, Stas, Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

Content

show
hide
Free keywords: -
 MPIS_GROUPS: Planets and Comets
 Abstract: As an Earth-like planet Venus probably had a primordial dipole field for several million years after formation of the planet. Since this dipole field eventually vanished the ionosphere of Venus has been exposed to the solar wind. The solar wind is shocked near Venus, and then scavenges the ionospheric particles through the magnetosheath and the magnetotail. The escape rate of oxygen ions (O+) estimated from spacecraft observations over the past several decades has manifested its importance for the evolution of planetary habitability, considering the accumulated effect over the history of Venus. However, all the previous observations were made in the shocked solar wind and/or inside the wake, though some simulations showed that unshocked solar wind can also ablate O+ ions. Here we report Venus Express observations of O+ ions in the unshocked solar wind during the solar minimum. The observations suggest that these O+ ions are accelerated by the unshocked solar wind through pickup processes. The estimated O+ escape rate, 2.1 × 1024 ions/s, is comparable to those measured in the shocked solar wind and the wake. This escape rate could result in about 2 cm global water loss over 4.5 billion years. Our results suggest that the atmospheric loss at unmagnetized planets is significantly underestimated by previous observations, and thus we can emphasize the importance of an Earth-like dipole for planetary habitability.

Details

show
hide
Language(s): eng - English
 Dates: 2018-05-072017
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.scib.2017.11.006
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Science Bulletin
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 62 (24) Sequence Number: - Start / End Page: 1669 - 1672 Identifier: ISSN: 2095-9273