2003/09/26 by J. Sánchez Alméida, J. Sanchez Almeida, I. Dominguez Cerdena +2 · 2 citations
Computer Science · Energy · Engineering · Physics and Astronomy · #Photovoltaic System Optimization Techniques #Solar Radiation and Photovoltaics #astro-ph #solar cell performance optimization
paper · pdf · doi:10.1086/379969
published as Astrophys.J.597:L177,2003 · ApJL, accepted
arxiv created 2003/09/26 · openalex publication_date 2003/10/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present the first simultaneous infrared (IR) and visible spectro-polarimetric observations of a solar internetwork region. The Fe I lines at 6301.6 A, 6302.5 A, 15648 A, and 15652 A were observed, with a lag of only 1 min, using highly sensitive spectro-polarimeters operated in two different telescopes (VTT and THEMIS at the Observatorio del Teide). Some 30% of the observed region shows IR and visible Stokes V signals above noise. These polarization signals indicate the presence of kG magnetic field strengths (traced by the visible lines) co-existing with sub-kG fields (traced by the infrared lines). In addition, one quarter of the pixels with signal have visible and IR Stokes V profiles with opposite polarity. We estimate the probability density function of finding each longitudinal magnetic field strength in the region. It has a tail of kG field strengths that accounts for most of the (unsigned) magnetic flux of the region.