About: Flare line impact polarization Na D2 589 nm line polarization in the 2001 June 15 flare     Goto   Sponge   NotDistinct   Permalink

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  • The impact polarization of optical chromospheric lines in solar flares is still being debated. For this reason, additional observations and improved flare atmosphere models are needed still. The polarization-free telescope THEMIS used in multiline 2 MulTiRaies (MTR) mode allows accurate simultaneous linear polarization measurements in various spectral lines. The Na D2 line is linearly polarized with a polarization degree exceeding 5% at some locations. The polarization was found to be radial at outer ribbons edges, and tangential at their inner edges. This orientation change may be due to differences in electron distribution functions on the opposite borders of flare chromospheric ribbons. Electron beams propagating along magnetic field lines, together with return currents, could explain both radial and tangential polarization. At the inner ribbon edges, intensity profile-width enlargements and blueshifts in polarization profiles are observed. This suggests chromospheric evaporation.
  • The impact polarization of optical chromospheric lines in solar flares is still being debated. For this reason, additional observations and improved flare atmosphere models are needed still. The polarization-free telescope THEMIS used in multiline 2 MulTiRaies (MTR) mode allows accurate simultaneous linear polarization measurements in various spectral lines. The Na D2 line is linearly polarized with a polarization degree exceeding 5% at some locations. The polarization was found to be radial at outer ribbons edges, and tangential at their inner edges. This orientation change may be due to differences in electron distribution functions on the opposite borders of flare chromospheric ribbons. Electron beams propagating along magnetic field lines, together with return currents, could explain both radial and tangential polarization. At the inner ribbon edges, intensity profile-width enlargements and blueshifts in polarization profiles are observed. This suggests chromospheric evaporation. (en)
Title
  • Flare line impact polarization Na D2 589 nm line polarization in the 2001 June 15 flare
  • Flare line impact polarization Na D2 589 nm line polarization in the 2001 June 15 flare (en)
skos:prefLabel
  • Flare line impact polarization Na D2 589 nm line polarization in the 2001 June 15 flare
  • Flare line impact polarization Na D2 589 nm line polarization in the 2001 June 15 flare (en)
skos:notation
  • RIV/67985815:_____/13:00399161!RIV14-GA0-67985815
http://linked.open...avai/predkladatel
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  • I, P(GAP209/12/0103)
http://linked.open...iv/cisloPeriodika
  • August
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  • 75266
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  • RIV/67985815:_____/13:00399161
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  • Sun; polarization; activity (en)
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  • FR - Francouzská republika
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  • [E1BECA26F871]
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  • Astronomy & Astrophysics
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  • 556
http://linked.open...iv/tvurceVysledku
  • Karlický, Marian
  • Hénoux, J. C.
http://linked.open...ain/vavai/riv/wos
  • 000323893500095
issn
  • 0004-6361
number of pages
http://bibframe.org/vocab/doi
  • 10.1051/0004-6361/201219478
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