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  • Inverze magnetické polarity vnořené v převážně unipolárním rychlém slunečním větru byly pozorovány sondou Ulysses ve vysokých heliocentrických šířkách. Tyto inverze mají vlastnosti přeložených magnetických siločar. Jako generační mechanismus těchto struktur navrhujeme interakci standardní silné, nizkofrekvenční Alfvénovské turbulence s rychlostními kluzy (shears). V tomto článku prezentujeme výsledky dvoudimenzionálních magnetohydrodynamické simulace nízkofrekvenční silné Alfvénovy vlny vnořené v rychlostním kluzu srovnatelném s mikrotoky (microstreams) ve slunečním větru. Simulace ukazují, že tato konfigurace přirozeně generuje magnetické inverze na časových škálách konzistentních s pozorováními sondy Ulysses. Generovaná struktura magnetického pole a plazmatu v simulaci je podobná stukturám pozorovaným. Diskutujeme roli interakcí mezi turbulencí a rychlostními kluzy, která může omezovat rychlostní rozdíly v asymptotickém rychlém slunečním větru. (cs)
  • Magnetic field polarity inversions embedded in the predominantly unipolar fast solar wind have been observed by the Ulysses spacecraft at high latitudes. Such reversals have the nature of folded back field lines which we suggest are generated by the interaction of standard large amplitude, low frequency, Alfvénic turbulence with velocity shears in the fast solar wind. We present 2D magnetohydrodynamic simulations of a very low frequency and high amplitude Alfvén wave propagating away from the sun embedded in a velocity shear structure such as a microstream and show how reversals in the magnetic field lines are generated naturally on a time-scale consistent with their observation at Ulysses. The generated magnetic field and plasma signals are similar to those observed. We discuss the role turbulence-stream shear interactions might play in limiting differential velocities in the asymptotic high speed solar wind.
  • Magnetic field polarity inversions embedded in the predominantly unipolar fast solar wind have been observed by the Ulysses spacecraft at high latitudes. Such reversals have the nature of folded back field lines which we suggest are generated by the interaction of standard large amplitude, low frequency, Alfvénic turbulence with velocity shears in the fast solar wind. We present 2D magnetohydrodynamic simulations of a very low frequency and high amplitude Alfvén wave propagating away from the sun embedded in a velocity shear structure such as a microstream and show how reversals in the magnetic field lines are generated naturally on a time-scale consistent with their observation at Ulysses. The generated magnetic field and plasma signals are similar to those observed. We discuss the role turbulence-stream shear interactions might play in limiting differential velocities in the asymptotic high speed solar wind. (en)
Title
  • Heliospheric magnetic field polarity inversions driven by radial velocity field structures
  • Heliosferické inverze magnetické polarity generované strukturami v poli radiální rychlosti (cs)
  • Heliospheric magnetic field polarity inversions driven by radial velocity field structures (en)
skos:prefLabel
  • Heliospheric magnetic field polarity inversions driven by radial velocity field structures
  • Heliosferické inverze magnetické polarity generované strukturami v poli radiální rychlosti (cs)
  • Heliospheric magnetic field polarity inversions driven by radial velocity field structures (en)
skos:notation
  • RIV/68378289:_____/06:00041373!RIV07-AV0-68378289
http://linked.open.../vavai/riv/strany
  • L14101/1;L14101/5
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • Z(AV0Z30420517)
http://linked.open...iv/cisloPeriodika
  • 14
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 477555
http://linked.open...ai/riv/idVysledku
  • RIV/68378289:_____/06:00041373
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • solar wind; magnetic field polarity inversions; microstreams; turbulence (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • US - Spojené státy americké
http://linked.open...ontrolniKodProRIV
  • [B1D6CE200656]
http://linked.open...i/riv/nazevZdroje
  • Geophysical Research Letters
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 33
http://linked.open...iv/tvurceVysledku
  • Hellinger, Petr
  • Landi, S.
  • Velli, M.
http://linked.open...n/vavai/riv/zamer
issn
  • 0094-8276
number of pages
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