Direct Measurement of Low‐Energy Electron Foreshock Beams

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F19%3A00510734" target="_blank" >RIV/68378289:_____/19:00510734 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/19:10407573

Result on the web

<a href="https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JA026470" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JA026470</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2019JA026470" target="_blank" >10.1029/2019JA026470</a>

Result language

angličtina

Original language name

Direct Measurement of Low‐Energy Electron Foreshock Beams

Original language description

Electrostatic plasma waves above and below the local electron plasma frequency represent a characteristic feature of the foreshock region. These waves are known to be generated by electron beams originating from the bow shock and their spectrum varies from narrowband intense waves close to foreshock edge to weaker broadband emissions further downstream. We present a statistical analysis of electron beams observed in the terrestrial foreshock by the Cluster spacecraft. We compared the energy of foreshock electron beams with the spectrum of electrostatic waves and established a clear correspondence between beam energy and spectrum of the waves. The broadband emissions are correlated with low-energy beams, while high-energy electron beams are associated with narrowband Langmuir waves. Next we solved the linear dispersion relation for a subset of observed electron plasma distributions. We discovered that while the observed electron distributions often exhibit a 'bump on tail' feature necessary for an instability, the observed combination of beam energy, density, and temperature typically corresponds to a stable situation. This indicates that strongly unstable electron beams are quickly dissipated by the quasi-linear processes and only stable or marginally stable beams persist long enough to be observed by the instrument.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

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

Publication year

2019

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

124

Issue of the periodical within the volume

4

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

2380-2392

UT code for WoS article

000477707800002

EID of the result in the Scopus database

2-s2.0-85064175144