Solar prominence polarimetry
Informazioni aggiuntive
Autori
Wiehr E.,
Bianda M.
Tipo
Articolo pubblicato in rivista scientifica
Anno
2003
Lingua
Inglese
Abstract
We measure the resonance polarization in solar prominences in Hα , Hβ and HeD3. A two-dimensional set-up with narrow-band filter, polarization analyzer and CCD camera is used to take prominence images in polarized light at high spatial resolution. Placed on a coudé telescope's hour axis, the observations near the equinoxia are free from purely instrumental polarization. Above the 0.1% noise limit, the Balmer lines do not show a polarization in contrast to the HeD3 line. Here, we determine the complete polarization profile after exchange of filter and CCD with the spectrograph, keeping the polarization analyzer fixed. In most prominences the Stokes-U and -Q profiles are not similar to Stokes-I: occasionally the blue and the red components of the emission are equal or even show a reverse ratio. This fits calculations for magnetic field strengths of the order of 50 Gauß being markedly stronger than commonly assumed.
Rivista
Astronomy and Astrophysics
Volume
404
Pagina inizio
L25
Pagina fine
L28
Parole chiave
irsol-refereed-scientific-papers
