Reconstruction of a Hundred Years Series of Solar Filaments from Daily Observational Data

The preliminary results of solar filaments distinguished in daily H-alpha observations at Kodaikanal (1912–2002) are presented. To mark the boundaries of solar filaments, methods based on automated procedures of marking low-contrast objects on the solar disk, as well as editing of the marked boundar...

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Bibliographic Details
Published inGeomagnetism and Aeronomy Vol. 57; no. 7; pp. 825 - 828
Main Authors Tlatova, K. A., Vasil’eva, V. V., Tlatov, A. G.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.12.2017
Springer Nature B.V
Subjects
Boundaries
Earth and Environmental Science
Earth Sciences
Filaments
Geophysics/Geodesy
Hemispheres
Magnetic fields
Solar filaments
Solar flares
Space exploration
Sunspots
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Summary:The preliminary results of solar filaments distinguished in daily H-alpha observations at Kodaikanal (1912–2002) are presented. To mark the boundaries of solar filaments, methods based on automated procedures of marking low-contrast objects on the solar disk, as well as editing of the marked boundaries in a semiautomated manner, were developed. The characteristics of solar filaments were analyzed. Latitudinal diagrams of filaments number in 15–23 activity cycles were constructed. As is shown, one maximum in the filament latitudinal distribution may be clearly distinguished during activity cycles in both hemispheres. This maximum is located slightly higher (θ ~ 25°–30°) than the sunspot distribution maximum (θ ~ 14°–17°). However, there are no other local maxima related to the zonal structure of the large-scale magnetic field (Makarov and Sivaraman, 1989).
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793217070222