ANGEO Annales Geophysicae ANGEO Ann. Geophys. 1432-0576 Copernicus Publications Göttingen, Germany 10.5194/angeo-32-651-2014 Mirror mode structures near Venus and Comet P/Halley Schmid D. https://orcid.org/0000-0001-7818-4338 1 Volwerk M. https://orcid.org/0000-0002-4455-3403 1 Plaschke F. https://orcid.org/0000-0002-5104-6282 1 Vörös Z. https://orcid.org/0000-0001-7597-238X 1 Zhang T. L. 1 2 Baumjohann W. https://orcid.org/0000-0001-6271-0110 1 Narita Y. https://orcid.org/0000-0002-5332-8881 1 Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria University of Science and Technology of China, Hefei, China 17 06 2014 32 6 651 657 Copyright: © 2014 D. Schmid et al. 2014 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://angeo.copernicus.org/articles/32/651/2014/angeo-32-651-2014.html The full text article is available as a PDF file from https://angeo.copernicus.org/articles/32/651/2014/angeo-32-651-2014.pdf

In this paper, we study where mirror mode structures are generated near unmagnetized solar system bodies (Venus and comet P/Halley measured in situ by Venus Express and Giotto). To estimate the location of the mirror mode source region at Venus, we apply a turbulent diffusion model of mirror mode structures, which has already been successfully tested in planetary magnetosheaths (Earth, Jupiter, Saturn). It enables us to estimate the distance between the measured location of the mirror mode and the origin of the mirror mode structure through the mirror mode size. We find that the scenario of mirror mode excitation at the bow shock with subsequent convection and diffusion downstream to the magnetopause is valid for Venus. In the cometary case, however, we find that the size of the mirror mode structure is comparable to the gyroradius of water group ions. This suggests local production of mirror mode structures in the cometary magnetosheath, most likely through fresh ion pickup, as opposed to the convection and diffusion mechanism at Venus.

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