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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/angeo-2018-110
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 28 Sep 2018

Regular paper | 28 Sep 2018

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

Wave activity in front of high-β Earth bow shocks

Anatoli A. Petrukovich, Olga M. Chugunova, and Pavel I. Shustov Anatoli A. Petrukovich et al.
  • Space Research Institute of Russian Academy of Sciences, Moscow, Russia

Abstract. Earth's bow shock in high β (ratio of thermal to magnetic pressure) solar wind environment is relatively rare phenomenon. However such a plasma object may be of interest for astrophysics. We survey statistics of high-β (β>10) shock observations by near-Earth spacecraft since 1995. Typical solar wind parameters related with high β are: low speed, high density and very low IMF 1–2nT. These conditions are usually quite transient and need to be verified immediately upstream of the observed shock crossings. About a hundred crossings were initially identified mostly with quazi-perpendicular geometry and high Mach number. In this report 22 Cluster project crossings are studied with spacecraft separation within 30–200km. Observed shock front structure is different from that for quaziperpendicular supercritical shocks with β=1. There is no well defined ramp. Dominating magnetic waves have frequency 0.1–0.5Hz (in some events 1–2Hz). Polarization has no stable phase and is closer to linear. In some cases it is possible to determine wavelength at 0.1–0.5Hz of the order of 200–900km.

Anatoli A. Petrukovich et al.
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Short summary
Earth's bow shock in high beta (beta is ratio of thermal to magnetic pressure) solar wind environment is rare phenomenon. We survey statistics of beta > 10 shock observations. Typical solar wind parameters related with high beta are: low speed, high density and very low IMF 1–2 nT. In this report 22 crossings are studied with spacecraft separation within 30–200 km. Dominating magnetic waves have frequency 0.1–0.5 Hz Polarization has no stable phase and is closer to linear.
Earth's bow shock in high beta (beta is ratio of thermal to magnetic pressure) solar wind...
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