Results 271 to 280 of about 38,972 (307)

Properties of Solar Active Regions

1972
‘Solar activity’ is a rather general term for quite a number of different phenomena occurring in the photosphere, in the chromosphere and in the corona. These ‘active’ phenomena are: (1) structures such as spots, plages, filaments, flares and coronal condensations; (2) gradual and impulsive enhancements of radiation in the EUV, X-ray and radio region ...
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Development of Solar Active Regions

2013
The birth, growth, and decay of solar active regions are described. The appearance of active regions in different atmospheric layers is examined, and the coronal extension of active regions is considered. The use of Skylab soft X-ray and extreme UV observations for studying the complex loop structure of active regions in the solar corona and the ...
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The fuzzy forecast of the activity of solar active regions

Astrophysics and Space Science, 2002
In this paper, the theory and method of fuzzy mathematics are applied to forecast the activity of solar active regions. According to the correlation between flares and several solar activity indices of active regions, the membership functions are constructed to comprehensively evaluate and predict the activity of solar active regions.
Shu-Rong Zhou, Guang-Li Huang, Zheng-Zhong Han, Cheng Fang   +3 more
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Automatic Detection of Active Regions on Solar Images

2004
In this paper techniques are described for the automated detection of solar Active Regions (ARs). AR detection is achieved using intensity thresholds and a region growing procedure. These procedures have been tested on full-disk solar images from the Meudon observatory for the months of April and July 2002 and compared with their manually generated ...
Ali Benkhalil, Valentina V. Zharkova, Stanley S. Ipson, Sergei I. Zharkov   +3 more
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On polarimetry in solar active regions

Solar Physics, 1974
E. Wiehr, M. Rossbach
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An Automatic Detection for Solar Active Regions Based on Scale-Invariant Feature Transform and Clustering by Fast Search and Find of Density Peaks

Chinese Astronomy and Astrophysics, 2022
Zheng Sheng
exaly  

The north-south asymmetry of active regions of different magneto-morphological types in solar cycles 23 and 24

Advances in Space Research, 2023
A V Zhukova, D D Sokoloff, V I Abramenko
exaly  

On polarimetry in solar active regions

Solar Physics, 1970
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On the Magnetic Field Activity in Solar Active Regions

1991
In this short note a new method of analysis of the complexity and of the reactivity of ensembles of magnetic features in the solar active regions is proposed and briefly discussed.
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Active Region Contributions to the Solar Wind over Multiple Solar Cycles

Solar Physics, 2021
David Stansby, L M Green, L Van Driel-Gesztelyi   +2 more
exaly