Počet záznamů: 1
Spectral properties of Langmuir and beam-mode waves observed inside terrestrial foreshock by Cluster spacecraf
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SYSNO ASEP 0472426 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Zařazení RIV Není vybrán druh dokumentu Název Spectral properties of Langmuir and beam-mode waves observed inside terrestrial foreshock by Cluster spacecraf Tvůrce(i) Píša, David (UFA-U) RID, ORCID
Souček, Jan (UFA-U) RID, ORCID
Santolík, Ondřej (UFA-U) RID, ORCIDCelkový počet autorů 3 Zdroj.dok. AGU Fall Meeting. - San Francisco : American Geophysical Union, 2016
SM13A-2187Poč.str. 1 s. Forma vydání Online - E Akce AGU Fall Meeting 2016 Datum konání 12.12.2016 - 16.12.2016 Místo konání San Francisco Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova electrostatics plasma waves ; Langmuir waves ; beam-mode waves ; bow shock ; Cluster spacecraf Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Institucionální podpora UFA-U - RVO:68378289 Anotace Electrostatic plasma waves are commonly observed in the upstream regions of planetary shocks. Solar wind electrons accelerated at the shock front are reflected back into the solar wind and form electron beams. The electron distribution becomes unstable and electrostatic waves are generated inside the foreshock region. The processes of generation and evolution of electrostatic waves significantly depend on the solar wind plasma conditions and generally exhibit complex behavior. Langmuir waves can be identified as intense narrowband emission at the local plasma frequency and weaker broadband beam-mode waves below and above the plasma frequency deeper in the downstream region. We present a long-term survey of Langmuir and beam-mode waves in the vicinity of the plasma frequency observed upstream of the terrestrial bow shock by the Cluster spacecraft. Using solar wind data and bow shock positions from OMNI, as well as in-situ measurements of interplanetary magnetic field, we have mapped all available spacecraft positions into foreshock coordinates. For a study of plasma waves, we have used spectra and local plasma frequencies obtained from a passive and active mode of the WHISPER instrument. We show a spatial distribution of wave frequencies and spectral widths as a function of foreshock positions and solar wind conditions.
Pracoviště Ústav fyziky atmosféry Kontakt Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Rok sběru 2017
Počet záznamů: 1