Solar Wind Deflection in the Foreshock: Model-Data Comparison

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10423172" target="_blank" >RIV/00216208:11320/20:10423172 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Q_jgRSzhx-" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Q_jgRSzhx-</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2019JA026970" target="_blank" >10.1029/2019JA026970</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Solar Wind Deflection in the Foreshock: Model-Data Comparison

Popis výsledku v původním jazyce

We present the results of a 2.5-D (2-D in space and 3-D in currents and electromagnetic fields) electromagnetic hybrid simulation run for foreshock wave activity during an interval of a radial interplanetary magnetic field (IMF). The simulation predicts nonlinear waves and foreshock expansion in connection with the development of cavitons and the formation of the foreshock compressional boundary. Fluctuations of the ion velocity V-Y component are associated with wave fronts corresponding to small wave normal angles and oscillate around 0 in the far upstream region. At distances closer to the bow shock, these fluctuations become asymmetric with duskward flow perturbations dominating at dusk and dawnward flow perturbations at dawn. We compare this simulation with THEMIS observations of large-amplitude quasi-monochromatic variations of ion velocity in the foreshock under radial IMF. A case study of simultaneous dual observations of unipolar V-Y fluctuations is followed by a statistical study of similar solar wind deflections in the foreshock. The observations that confirm the simulation predictions indicate that, in addition to ion heating, ultralow-frequency waves participate in the magnetosheath-like plasma flow deflection in the foreshock during periods of small IMF cone angles.

Název v anglickém jazyce

Solar Wind Deflection in the Foreshock: Model-Data Comparison

Popis výsledku anglicky

We present the results of a 2.5-D (2-D in space and 3-D in currents and electromagnetic fields) electromagnetic hybrid simulation run for foreshock wave activity during an interval of a radial interplanetary magnetic field (IMF). The simulation predicts nonlinear waves and foreshock expansion in connection with the development of cavitons and the formation of the foreshock compressional boundary. Fluctuations of the ion velocity V-Y component are associated with wave fronts corresponding to small wave normal angles and oscillate around 0 in the far upstream region. At distances closer to the bow shock, these fluctuations become asymmetric with duskward flow perturbations dominating at dusk and dawnward flow perturbations at dawn. We compare this simulation with THEMIS observations of large-amplitude quasi-monochromatic variations of ion velocity in the foreshock under radial IMF. A case study of simultaneous dual observations of unipolar V-Y fluctuations is followed by a statistical study of similar solar wind deflections in the foreshock. The observations that confirm the simulation predictions indicate that, in addition to ion heating, ultralow-frequency waves participate in the magnetosheath-like plasma flow deflection in the foreshock during periods of small IMF cone angles.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA17-06065S" target="_blank" >GA17-06065S: Variace slunečního větru a jejich vazba na dynamiku magnetosféry Země</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Journal of Geophysical Research. Space Physics

ISSN

2169-9380

e-ISSN

—

Svazek periodika

125

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

e2019JA026970

Kód UT WoS článku

000535395800011

EID výsledku v databázi Scopus

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