Circular polarization of the CA II H and K lines in solar quiet and active regions
1990; IOP Publishing; Volume: 361; Linguagem: Inglês
10.1086/185832
ISSN1538-4357
AutoresV. Martı́nez Pillet, R. J. Garcı́a López, J. C. del Toro Iniesta, R. Rébolo, M. Vázquez, J. E. Beckman, S. Char,
Tópico(s)Ionosphere and magnetosphere dynamics
Resumoview Abstract Citations (23) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Circular Polarization of the CA II H and K Lines in Solar Quiet and Active Regions Martinez Pillet, V. ; Garcia Lopez, R. J. ; del Toro Iniesta, J. C. ; Rebolo, R. ; Vazquez, M. ; Beckman, J. E. ; Char, S. Abstract A representative set of profiles is presented for the Ca II H resonace line in Stokes V and I, for the quiet sun, plages, sunspot umbrae, and a flare, as well as one example of the Ca II K line in a sunspot penumbra. The degree of polarization is highest in the spots and zero in the quiet sun, within error limits. The V profile asymmetries are, however, highest in the flare. The spectra of the Ca II K line are used to obtain a linear relation between V(lambda) and -dI/d(lambda) and a value for B(parallel) of 820 + or - 40 G using the weak-field approximation. Publication: The Astrophysical Journal Pub Date: October 1990 DOI: 10.1086/185832 Bibcode: 1990ApJ...361L..81M Keywords: Calcium; Circular Polarization; H Lines; K Lines; Solar Activity; Solar Spectra; Emission Spectra; Line Spectra; Solar Flares; Solar Magnetic Field; Sunspots; Solar Physics; CA II EMISSION; POLARIZATION; SUN: CHROMOSPHERE; SUN: MAGNETIC FIELDS full text sources ADS |
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