Solar magnetic fields measurements with a magneto-optical filter

Autor:	Roger K. Ulrich, E. J. Rhodes, P. Rosati, Steven Tomczyk, D. Ricci, Alessandro Cacciani, Edward J. Smith
Rok vydání:	1990
Předmět:	Physics Photosphere Zeeman effect business.industry Polarization (waves) Magnetic flux Magnetic field symbols.namesake Optics Magnetogram symbols Astrophysics::Solar and Stellar Astrophysics Vector field Helioseismology business
Zdroj:	Il Nuovo Cimento C. 13:125-130
ISSN:	0390-5551
DOI:	10.1007/bf02515781
Popis:	The presence of a magnetic field at different levels inside the sun has crucial implications for helioseismology. The solar oscillation observing program carried out since 1983 at Mt. Wilson with Cacciani magneto-optical filter has recently been modified to acquire full-disk magnetograms with 2 arcsec spatial resolution. A method for the correct determination of magnetic maps which are free of contamination by velocity signal is presented. It is shown that no cross-talk exists between the Doppler and Zeeman shifts of the Na D lines, provided that instrumental polarization effects are taken into account. The observed line-of-sight photospheric field was used to map the vector field in the inner corona, above active regions, in the current free approximation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a2bd0224c79799ac89261aeca8c34198 https://doi.org/10.1007/bf02515781 Zobrazit plný text záznamu Full text from SpringerLink