Magnetospheric Line Radiation Observed Close to the Source: Properties and Propagation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F23%3A00573097" target="_blank" >RIV/68378289:_____/23:00573097 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/23:10475795

Výsledek na webu

<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023JA031454" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023JA031454</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2023JA031454" target="_blank" >10.1029/2023JA031454</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Magnetospheric Line Radiation Observed Close to the Source: Properties and Propagation

Popis výsledku v původním jazyce

Magnetospheric Line Radiation (MLR) is a type of whistler mode electromagnetic wave phenomenon observed in the inner magnetosphere at frequencies of a few kilohertz, that is characterized by a frequency modulation of the wave intensity. Although such events are quite regularly observed by ground-based stations and low-altitude spacecraft, their observations in the equatorial region at larger radial distances (i.e., close to tentative source regions) are extremely limited, likely due to the generally low frequency resolution of available measurements. A systematic search for MLR in continuous intervals of high-resolution multicomponent wave data obtained by the Van Allen Probes spacecraft detects 15 events. They occur primarily on the dayside at frequencies between about 1 and 5 kHz, propagating with oblique wave normals away from the geomagnetic equator. For one event, simultaneous ground-based observations are available, providing limits on the spatial extent of the event: it does not extend beyond the high-density plasmasphere region. An electrostatic wave at a frequency corresponding to the modulation frequency of MLR is observed in three events. This is likely linked to the event formation mechanism and has not been observed before. Our results can lead to an understanding of the formation mechanism of MLR.

Název v anglickém jazyce

Magnetospheric Line Radiation Observed Close to the Source: Properties and Propagation

Popis výsledku anglicky

Magnetospheric Line Radiation (MLR) is a type of whistler mode electromagnetic wave phenomenon observed in the inner magnetosphere at frequencies of a few kilohertz, that is characterized by a frequency modulation of the wave intensity. Although such events are quite regularly observed by ground-based stations and low-altitude spacecraft, their observations in the equatorial region at larger radial distances (i.e., close to tentative source regions) are extremely limited, likely due to the generally low frequency resolution of available measurements. A systematic search for MLR in continuous intervals of high-resolution multicomponent wave data obtained by the Van Allen Probes spacecraft detects 15 events. They occur primarily on the dayside at frequencies between about 1 and 5 kHz, propagating with oblique wave normals away from the geomagnetic equator. For one event, simultaneous ground-based observations are available, providing limits on the spatial extent of the event: it does not extend beyond the high-density plasmasphere region. An electrostatic wave at a frequency corresponding to the modulation frequency of MLR is observed in three events. This is likely linked to the event formation mechanism and has not been observed before. Our results can lead to an understanding of the formation mechanism of MLR.

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

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

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

2169-9402

Svazek periodika

128

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

e2023JA031454

Kód UT WoS článku

000999856300001

EID výsledku v databázi Scopus

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