Oblique lower band chorus waves: Time shifts between discrete elements observed by the Cluster spacecraft

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F09%3A00335031" target="_blank" >RIV/68378289:_____/09:00335031 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Oblique lower band chorus waves: Time shifts between discrete elements observed by the Cluster spacecraft

Popis výsledku v původním jazyce

We report observations of remarkable frequency differences and time shifts between the corresponding elements of lower band chorus recorded by the four Cluster spacecraft at low magnetic latitudes. Surprisingly, the spacecraft located closer to the equator systematically received the corresponding chorus elements later than the spacecraft located at higher magnetic latitudes. The time shifts and frequency differences depended almost linearly on the perpendicular distance between the various spacecraft.Analysis of data shows that chorus emissions were generated with highly oblique angles of propagation. We show that the sources moving across the magnetic field lines are reasonably consistent with these observations. We propose that the transverse motion of the chorus sources is a consequence of a feedback between the oblique waves and counter streaming electrons during nonlinear cyclotron interactions, and we provide an estimate of the transverse velocity of the source.

Název v anglickém jazyce

Oblique lower band chorus waves: Time shifts between discrete elements observed by the Cluster spacecraft

Popis výsledku anglicky

We report observations of remarkable frequency differences and time shifts between the corresponding elements of lower band chorus recorded by the four Cluster spacecraft at low magnetic latitudes. Surprisingly, the spacecraft located closer to the equator systematically received the corresponding chorus elements later than the spacecraft located at higher magnetic latitudes. The time shifts and frequency differences depended almost linearly on the perpendicular distance between the various spacecraft.Analysis of data shows that chorus emissions were generated with highly oblique angles of propagation. We show that the sources moving across the magnetic field lines are reasonably consistent with these observations. We propose that the transverse motion of the chorus sources is a consequence of a feedback between the oblique waves and counter streaming electrons during nonlinear cyclotron interactions, and we provide an estimate of the transverse velocity of the source.

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

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2009

Kód důvěrnosti údajů

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

Název periodika

Journal of Geophysical Research

ISSN

0148-0227

e-ISSN

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Svazek periodika

114

Číslo periodika v rámci svazku

-

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

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Kód UT WoS článku

000272946500001

EID výsledku v databázi Scopus

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