Poynting vector and wave vector directions of equatorial chorus
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F16%3A00472232" target="_blank" >RIV/68378289:_____/16:00472232 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/16:10336425
Result on the web
<a href="http://dx.doi.org/10.1002/2016JA023389" target="_blank" >http://dx.doi.org/10.1002/2016JA023389</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/2016JA023389" target="_blank" >10.1002/2016JA023389</a>
Alternative languages
Result language
angličtina
Original language name
Poynting vector and wave vector directions of equatorial chorus
Original language description
We present new results on wave vectors and Poynting vectors of chorus rising and falling tones on the basis of 6 years of THEMIS (Time History of Events and Macroscale Interactions during Substorms) observations. The majority of wave vectors is closely aligned with the direction of the ambient magnetic field (B-0). Oblique wave vectors are confined to the magnetic meridional plane, pointing away from Earth. Poynting vectors are found to be almost parallel to B-0. We show, for the first time, that slightly oblique Poynting vectors are directed away from Earth for rising tones and toward Earth for falling tones. For the majority of lower band chorus elements, the mutual orientation between Poynting vectors and wave vectors can be explained by whistler mode dispersion in a homogeneous collisionless cold plasma. Upper band chorus seems to require inclusion of collisional processes or taking into account azimuthal anisotropies in the propagation medium. The latitudinal extension of the equatorial source region can be limited to +/- 6 degrees around the B-0 minimum or approximately +/- 5000 km along magnetic field lines. We find increasing Poynting flux and focusing of Poynting vectors on the B-0 direction with increasing latitude. Also, wave vectors become most often more field aligned. A smaller group of chorus generated with very oblique wave normals tends to stay close to the whistler mode resonance cone. This suggests that close to the equatorial source region (within similar to 20 degrees latitude), a wave guidance mechanism is relevant, for example, in ducts of depleted or enhanced plasma density.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - 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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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2016
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
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Volume of the periodical
121
Issue of the periodical within the volume
12
Country of publishing house
US - UNITED STATES
Number of pages
17
Pages from-to
11912-11928
UT code for WoS article
000393183300020
EID of the result in the Scopus database
2-s2.0-85007085705