id:"swepub:oai:DiVA.org:kth-307357"
Sökning: id:"swepub:oai:DiVA.org:kth-307357" > First-year ion-acou...
- 1 av 1
- Föregående post
- Nästa post
- Till träfflistan
First-year ion-acoustic wave observations in the solar wind by the RPW/TDS instrument on board Solar Orbiter
-
- Pisa, D. (författare)
- Czech Acad Sci, Inst Atmospher Phys, Bocni 2 1401, Prague 14100, Czech Republic.
-
- Santolik, O. (författare)
- Czech Acad Sci, Inst Atmospher Phys, Bocni 2 1401, Prague 14100, Czech Republic.
-
- Hanzelka, M. (författare)
- Czech Acad Sci, Inst Atmospher Phys, Bocni 2 1401, Prague 14100, Czech Republic.;Charles Univ Prague, Fac Math & Phys, V Holesovickach 2, Prague 18000 8, Czech Republic.
- visa fler...
- visa färre...
- Czech Acad Sci, Inst Atmospher Phys, Bocni 2 1401, Prague 14100, Czech Republic Czech Acad Sci, Inst Atmospher Phys, Bocni 2 1401, Prague 14100, Czech Republic.;Charles Univ Prague, Fac Math & Phys, V Holesovickach 2, Prague 18000 8, Czech Republic. (creator_code:org_t)
- 2021-12-14
- 2021
- Engelska.
- Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 656
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Context. Electric field measurements of the Time Domain Sampler (TDS) receiver, part of the Radio and Plasma Waves (RPW) instrument on board Solar Orbiter, often exhibit very intense broadband wave emissions at frequencies below 20 kHz in the spacecraft frame. During the first year of the mission, the RPW/TDS instrument was operating from the first perihelion in mid-June 2020 and through the first flyby of Venus in late December 2020. Aims. In this paper, we present a year-long study of electrostatic fluctuations observed in the solar wind at an interval of heliocentric distances from 0.5 to 1 AU. The RPW/TDS observations provide a nearly continuous data set for a statistical study of intense waves below the local plasma frequency. Methods. The on-board and continuously collected and processed properties of waveform snapshots allow for the mapping plasma waves at frequencies between 200 Hz and 20 kHz. We used the triggered waveform snapshots and a Doppler-shifted solution of the dispersion relation for wave mode identification in order to carry out a detailed spectral and polarization analysis. Results. Electrostatic ion-acoustic waves are the most common wave emissions observed between the local electron and proton plasma frequency by the TDS receiver during the first year of the mission. The occurrence rate of ion-acoustic waves peaks around perihelion at distances of 0.5 AU and decreases with increasing distances, with only a few waves detected per day at 0.9 AU. Waves are more likely to be observed when the local proton moments and magnetic field are highly variable. A more detailed analysis of more than 10 000 triggered waveform snapshots shows the mean wave frequency at about 3 kHz and wave amplitude about 2.5 mV m(-1). The wave amplitude varies as R-1.38 with the heliocentric distance. The relative phase distribution between two components of the E-field projected in the Y - Z Spacecraft Reference Frame (SRF) plane shows a mostly linear wave polarization. Electric field fluctuations are closely aligned with the directions of the ambient field lines. Only a small number (3%) of ion-acoustic waves are observed at larger magnetic discontinuities.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- waves
- solar wind
- plasmas
- instabilities
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
- Astronomy and Astrophysics (Sök värdpublikationen i LIBRIS)
Till lärosätets databas
- 1 av 1
- Föregående post
- Nästa post
- Till träfflistan
Hitta mer i SwePub
- Av författaren/redakt...
- Pisa, D.
- Santolik, O.
- Hanzelka, M.
- Nicolaou, G.
- Maksimovic, M.
- Bale, S. D.
- visa fler...
- Chust, T.
- Khotyaintsev, Yu ...
- Krasnoselskikh, ...
- Kretzschmar, M.
- Lorfevre, E.
- Plettemeier, D.
- Steller, M.
- Stverak, S.
- Travnicek, P.
- Vaivads, Andris
- Vecchio, A.
- Horbury, T.
- O'Brien, H.
- Evans, V
- Angelini, V
- Owen, C. J.
- Louarn, P.
- Souček, J.
- visa färre...
- Om ämnet
-
- NATURVETENSKAP
- NATURVETENSKAP
- och Fysik
- och Fusion plasma oc ...
- Artiklar i publikationen
- Astronomy and As ...
- Av lärosätet
- Kungliga Tekniska Högskolan
- Uppsala universitet
Sök utanför SwePub
- Sök vidare i:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - Nationella bibliotekssystem
- LIBRIS.kb.se
