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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-2019-7
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-7
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 05 Feb 2019

Regular paper | 05 Feb 2019

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

Low frequency magnetic variations at 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 a rare phenomenon. However such an object is ubiquitous in astrophysical plasmas. Typical solar wind parameters related with high β (here β > 10) are: low speed, high density and very low IMF 1–2 nT. These conditions are usually quite transient and need to be verified immediately upstream of the observed shock crossings. We survey statistics of high-β shock observations by near-Earth spacecraft since 1995. About a hundred crossings were initially identified mostly with oblique or quasi-perpendicular geometry and high Mach number. In this report 22 crossings by Cluster project are studied with multipoint analysis, allowing to determine spatial scales. Observed shock structure is different from that for supercritical shocks with β ~ 1. The main magnetic field increase is smeared to couple tens of seconds and is dominated with magnetic variations ~ 0.1–0.5 Hz (in some events – 1–2 Hz). Their polarization has no stable phase and is closer to linear, while spatial scales are of the order of hundred km at 0.1–0.5 Hz.

Anatoli A. Petrukovich et al.
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Short summary
Earth's bow shock in solar wind with high thermal and low magnetic pressure is a rare phenomenon. However such an object is ubiquitous in astrophysical plasmas. These conditions are usually quite transient. We survey statistics of such shock observations since 1995. About a hundred crossings were initially identified. In this report 22 crossings by Cluster project are studied with multipoint analysis, allowing to determine spatial scales.
Earth's bow shock in solar wind with high thermal and low magnetic pressure is a rare...
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