Quasiperiodic Emissions and Related Particle Precipitation Bursts Observed by the DEMETER Spacecraft
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F21%3A00547878" target="_blank" >RIV/68378289:_____/21:00547878 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/21:10439887
Result on the web
<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021JA029621" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021JA029621</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2021JA029621" target="_blank" >10.1029/2021JA029621</a>
Alternative languages
Result language
angličtina
Original language name
Quasiperiodic Emissions and Related Particle Precipitation Bursts Observed by the DEMETER Spacecraft
Original language description
Electromagnetic waves observed in the inner magnetosphere at frequencies between about 0.5 and 4 kHz sometimes exhibit a quasiperiodic (QP) time modulation of the wave intensity with modulation periods from tens of seconds up to a few minutes. Such waves are typically termed ´QP emissions´ and their origin is still not fully understood. We use a large set of more than 2,000 of these events identified in the low-altitude DEMETER spacecraft data to check for energetic electron flux variations matching the individual QP wave elements. Altogether, seven such events are identified and their detailed analysis is performed. Energetic electron fluxes are found to be modulated primarily at energies lower than about 250 keV. While the waves may propagate unducted across L-shells, the energetic particles follow magnetic field lines from the interaction region down to the observation point. This is used to estimate the locations of anticipated generation regions to L-shells between about 4 and 6, and the respective source radial dimensions to about 0.6-1.2 Earth radii. The frequencies of the events are confined below half of the equatorial electron gyrofrequency in the determined source regions. Finally, it is shown that individual QP elements exhibit a fine inner structure corresponding to the wave bouncing between the hemispheres.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
<a href="/en/project/GA21-01813S" target="_blank" >GA21-01813S: Anthropogenic electromagnetic emissions and their effects on the Earth’s inner magnetosphere</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Geophysical Research-Space Physics
ISSN
2169-9380
e-ISSN
2169-9402
Volume of the periodical
126
Issue of the periodical within the volume
10
Country of publishing house
US - UNITED STATES
Number of pages
12
Pages from-to
e2021JA029621
UT code for WoS article
000711498900005
EID of the result in the Scopus database
2-s2.0-85118169841