Preprints
https://doi.org/10.5194/angeo-2018-110
https://doi.org/10.5194/angeo-2018-110
28 Sep 2018
 | 28 Sep 2018
Status: this discussion paper is a preprint. It has been under review for the journal Annales Geophysicae (ANGEO). The manuscript was not accepted for further review after discussion.

Wave activity in front of high-β Earth bow shocks

Anatoli A. Petrukovich, Olga M. Chugunova, and Pavel I. Shustov

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 1–2 nT. 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 30–200 km. 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 0.1–0.5 Hz (in some events 1–2 Hz). Polarization has no stable phase and is closer to linear. In some cases it is possible to determine wavelength at 0.1–0.5 Hz of the order of 200–900 km.

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Anatoli A. Petrukovich, Olga M. Chugunova, and Pavel I. Shustov
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Anatoli A. Petrukovich, Olga M. Chugunova, and Pavel I. Shustov
Anatoli A. Petrukovich, Olga M. Chugunova, and Pavel I. Shustov

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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.