Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012arep...56..146o&link_type=abstract
Astronomy Reports, Volume 56, Issue 2, pp.146-152
Astronomy and Astrophysics
Astronomy
Scientific paper
SOHO-MDI daily magnetic field synoptic data (a 14-year series of daily maps of the solar magnetic field intensity B available at the site http://soi.stanford.edu/magnetic/index5.html) have been used to analyze the dynamics of the photospheric magnetic field in the vicinity of the solar equator. The standard deviation s B of the field B calculated over areas of tens of square degrees on the solar disk was taken as a basic index. An 11-year variation similar to that observed at higher latitudes is observed in the vicinity of the equator, and is similar for weak and strong fields; i.e., the solar cycle exists in the sunspot-free zone. New qualitative data support the idea that the weak background magnetic field increases toward the solar limb. This angular dependence suggests the existence of a transverse component of the background field. The magnetic fields in the vicinity of the equator were significantly different in the initial phases of Cycles 23 and 24. Annual variations of s B were observed near the center of the solar disk. These variations are due to two factors: the annual variation of the distance from the equator to the disk center and the increase of s B with with distance from the equator. Reliable detection of these variations is an evidence of high accuracy of the s B estimates.
Chertoprud V. E.
Obridko Vladimir N.
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