Equatorial noise emissions with a quasiperiodic modulation observed by DEMETER at harmonics of the O+ ion gyrofrequency

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F16%3A00472222" target="_blank" >RIV/68378289:_____/16:00472222 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/16:10334397

Result on the web

<a href="http://dx.doi.org/10.1002/2016JA022989" target="_blank" >http://dx.doi.org/10.1002/2016JA022989</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/2016JA022989" target="_blank" >10.1002/2016JA022989</a>

Result language

angličtina

Original language name

Equatorial noise emissions with a quasiperiodic modulation observed by DEMETER at harmonics of the O+ ion gyrofrequency

Original language description

The analysis of ionospheric equatorial noise (EN) with a quasiperiodic (QP) modulation observed by the Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) spacecraft is presented. These EN emissions, also called whistler mode or fast magnetosonic waves, play an important role in acceleration of radiation belt electrons. A statistical analysis with 103 events shows that they occur just after intense magnetic storms. Usually, they are generated by unstable proton ring distribution close to the magnetic equator at harmonics of the proton gyrofrequency in the inner magnetosphere (2 < L < 8). But at lower L values down in the ionosphere three events have been analyzed and it appears that the EN waves are at harmonics of—or very close to—a O+ ion gyrofrequency which can be found close to or slightly above the satellite. The wave propagation analysis indicates that these emissions are coming from an area above the satellite. Concerning one event, the EN emissions are observed on several consecutive orbits and there is a temporal coincidence with observations performed by the Cluster satellites at higher altitudes in the magnetosphere. EN emissions at lower frequencies have been also observed by the Cluster satellites in the same longitudinal sector as DEMETER but at 5 RE. The analysis of the Spatio Temporal Analysis of Field Fluctuations data on board C1 reveals that the magnetic field spectrogram has peaks close to harmonics of the local proton gyrofrequency as usually reported. It is shown that the DEMETER and Cluster EN waves have a similar QP modulation but with slightly different period and frequency.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BL - Plasma physics and discharge through gases

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2016

Confidentiality

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

Name of the periodical

Journal of Geophysical Research: Space Physics

ISSN

2169-9380

e-ISSN

—

Volume of the periodical

121

Issue of the periodical within the volume

10

Country of publishing house

US - UNITED STATES

Number of pages

14

Pages from-to

10289-10302

UT code for WoS article

000388965900065

EID of the result in the Scopus database

2-s2.0-84991688067