Observation of the Molecular Zeeman Effect in the G Band
Informazioni aggiuntive
Autori
Asensio Ramos A.,
Trujillo Bueno J.,
Bianda M.,
Manso Sainz R.,
Uitenbroek H.
Tipo
Articolo pubblicato in rivista scientifica
Anno
2004
Lingua
Inglese
Abstract
Here we report on the first observational investigation of the Zeeman effect in the G band around 4305 Å. Our spectropolarimetric observations of sunspots with the Zürich Imaging Polarimeter at the Istituto Ricerche Solari Locarno confirm our previous theoretical prediction that the molecular Zeeman effect produces measurable circular polarization signatures in several CH lines that are not overlapped with atomic transitions. We also find both circular and linear polarization signals produced by atomic lines whose wavelengths lie in the G-band spectral region. Together, such molecular and atomic lines are potentially important for empirical investigations of solar and stellar magnetism. For instance, a comparison between observed and calculated Stokes profiles suggests that the thermodynamical and/or magnetic properties of the photospheric regions of sunspot umbrae are horizontally structured with a component that might be associated with umbral dots.
Rivista
Astrophysical Journal, Letters
Volume
611
Pagina inizio
L61
Pagina fine
L64
DOI
Parole chiave
irsol-refereed-scientific-papers
