Non-stationarity of the quasi-perpendicular bow shock: comparison between Cluster observations and simulations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F11%3A00360928" target="_blank" >RIV/68378289:_____/11:00360928 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.ann-geophys.net/29/263/2011/angeo-29-263-2011.pdf" target="_blank" >http://www.ann-geophys.net/29/263/2011/angeo-29-263-2011.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5194/angeo-29-263-2011" target="_blank" >10.5194/angeo-29-263-2011</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Non-stationarity of the quasi-perpendicular bow shock: comparison between Cluster observations and simulations

Popis výsledku v původním jazyce

We performed full particle electromagnetic simulations of a quasi-perpendicular shock with parameters corresponding to the Earth's bow shock observed by Cluster on 24 January 2001. In run 1, modified two-stream instability (MTSI) is excited by the reflected solar wind ions. The waves due to the MTSI are on the whistler mode branch and have downstream directed phase velocities in the shock frame. The Poynting flux far upstream in the foot is also directed downstream. However, in the density and magneticfield compression region of the overshoot the waves are refracted and the Poynting flux in the shock frame points upstream. The MTSI is suppressed in the low mass ratio run 2, where significant reformation (?breathing) is observed. It is suggested that the high frequency upstream waves are due to the MTSI and are not related to a nonlinear phase standing whistler. Different profiles observed by different Cluster spacecraft are due to the non-stationary behavior on a larger time scale.

Název v anglickém jazyce

Non-stationarity of the quasi-perpendicular bow shock: comparison between Cluster observations and simulations

Popis výsledku anglicky

We performed full particle electromagnetic simulations of a quasi-perpendicular shock with parameters corresponding to the Earth's bow shock observed by Cluster on 24 January 2001. In run 1, modified two-stream instability (MTSI) is excited by the reflected solar wind ions. The waves due to the MTSI are on the whistler mode branch and have downstream directed phase velocities in the shock frame. The Poynting flux far upstream in the foot is also directed downstream. However, in the density and magneticfield compression region of the overshoot the waves are refracted and the Poynting flux in the shock frame points upstream. The MTSI is suppressed in the low mass ratio run 2, where significant reformation (?breathing) is observed. It is suggested that the high frequency upstream waves are due to the MTSI and are not related to a nonlinear phase standing whistler. Different profiles observed by different Cluster spacecraft are due to the non-stationary behavior on a larger time scale.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

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Projekt

—

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Annales Geophysicae

ISSN

0992-7689

e-ISSN

—

Svazek periodika

29

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

12

Strana od-do

263-274

Kód UT WoS článku

000287800700005

EID výsledku v databázi Scopus

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