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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-127
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-127
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 02 Sep 2019

Submitted as: regular paper | 02 Sep 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

On the magnetic characteristics of magnetic holes in the solar wind between Mercury and Earth

Martin Volwerk1, Charlotte Goetz2, Ferdinand Plaschke1, Tomas Karlsson3, and Daniel Heyner2 Martin Volwerk et al.
  • 1Space Research Institute, Austrian Academy of Sciences, Graz, Austria
  • 2Institute for Geophysics and Extraterrestrial Physics, Technische Universität Braunschweig, Germany
  • 3Department of Space and Plasma Physics, School of Electrical Engineering and Computer Science, Royal Institute of Technology, Stockholm, Sweden

Abstract. The occurrence rate of linear and pseudo magnetic holes has been determined during MESSENGER's cruise phase starting from Earth (2005) and arriving at Mercury (2011). It is shown that the occurrence rate of linear magnetic holes, defined as a maximum of 10° rotation of the magnetic field over the hole, slowly decreases from Mercury to Earth. The pseudo magnetic holes, defined as a rotation between 10° and 45° over the hole, have mostly a constant occurrence rate, with a slight increase in front of the Earth and a decrease around the Earth. The width and depth of these structures seem to strongly differ depending on whether they are inside or outside of Venus's orbit.

Martin Volwerk et al.
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In order to prepare for the usage of cruise phase data from BepiColombo to study magnetic structures in the solar wind we have turned to Messenger cruise phase data between the Earth and Mercury. These structures are characterized by a decrease in the magnetic field created by a temperature asymmetry. We find that their occurrence rate decreases outward from Mercury, and that they look different outside of Venus's orbit as inside.
In order to prepare for the usage of cruise phase data from BepiColombo to study magnetic...
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