Features of the Evolution of Active and Quiet Structures in Two Levels of the Sun’s Atmosphere

This paper analyzes the latitudinal and temporal variations of magnetic fields in the photosphere and variations of solar structures, such as active regions, coronal holes, and flocculi, in the Sun’s upper chromosphere. The investigation is based on two types of solar observations obtained in the Ki...

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Bibliographic Details
Published inGeomagnetism and Aeronomy Vol. 62; no. 7; pp. 873 - 881
Main Author Andreeva, O. A.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.12.2022
Springer Nature B.V
Subjects
Atmosphere
Chromosphere
Coronal holes
Earth and Environmental Science
Earth Sciences
Evolution
Geophysics/Geodesy
Magnetic fields
Photosphere
Solar corona
Solar cycle
Solar magnetic field
Solar observations
Sun
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Summary:This paper analyzes the latitudinal and temporal variations of magnetic fields in the photosphere and variations of solar structures, such as active regions, coronal holes, and flocculi, in the Sun’s upper chromosphere. The investigation is based on two types of solar observations obtained in the Kitt Peak observatory (United States) during almost three solar cycles, from January 1, 1977 to September 30, 2003. These are the synoptic maps of the strength of the longitudinal magnetic field of the Sun and observations of the solar chromosphere in the He I 1083 nm line. The aim of this work was to reveal features and interconnection of variations in magnetic fields of the photosphere and solar structures in the upper chromosphere in this period. Detailed comparison of weak magnetic fields (0–20 G) with coronal holes and stronger magnetic fields (50–200 G) with active regions reveals some features in the evolution of active and quiet structures in two levels of the Sun’s atmosphere―in the photosphere and in the chromosphere.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793222070052