Results 11 to 20 of about 9,553 (254)
Meridional motions of sunspots and sunspot groups
The Astrophysical Journal, 1986 Etude des positions des taches solaires et des groupes de taches determinees au Mont Wilson en lumiere blanche entre 1917 et 1983, afin d'examiner la nature des mouvements meridiens des taches et groupes durant cet ...
R. Howard, P. A. Gilman
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Relative Sunspot Number Observed from 2002 to 2011 at ButterStar Observatory [PDF]
Journal of Astronomy and Space Sciences, 2012 The ButterStar Observatory at the Dongducheon High School has been working for photographic observations of the Sun since October 16, 2002. In this study, we observed the Sun at the ButterStar observatory for 3,364 days from October 16, 2002 to December ...
Sung-Jin Oh, Heon-Young Chang
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Extremely large flares/multiple large flares expected from sunspot groups with large area
Earth, Planets and Space, 2022 The possible occurrence of major space weather events, such as large solar flares within one hundred years, is studied anticipating their effects on our social facilities.
Shinichi Watari
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Long-term variation in distribution of sunspot groups [PDF]
, 2004 We studied the relation between the distribution of sunspot groups and the Gleissberg cycle. As the magnetic field is related to the area of the sunspot groups, we used area-weighted sunspot group data. On the one hand, we confirm the previously reported
B. Major +13 more
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Research on Mount Wilson Magnetic Classification Based on Deep Learning
Advances in Astronomy, 2021 The Mount Wilson magnetic classification of sunspot groups is thought to be meaningful to forecast flares’ eruptions. In this paper, we adopt a deep learning method, CornerNet-Saccade, to perform the Mount Wilson magnetic classification of sunspot groups.
Yuanbo He +5 more
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Sunspot groups at high latitude [PDF]
Monthly Notices of the Royal Astronomical Society, 2000 Data of sunspot groups at high latitude (greater than or equal to 35 degrees), from the year 1874 to the present (2000 January), are collected to show their evolutional behaviour and to investigate features of the yearly number of sunspot groups at high latitude.
L. Kejun +4 more
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An alternative measure of solar activity from detailed sunspot datasets [PDF]
, 2016 The sunspot number is analyzed by using detailed sunspot data, including aspects of observability, sunspot sizes, and proper identification of sunspot groups as discrete entities of the solar activity.
Baranyi, Tünde +2 more
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Solar-Terrestrial Physics, 2016 This paper considers a longitude distribution of sunspot groups over 1982–2013, using data from the National Geophysical Data Center (Boulder, USA).
Rybak A.L.
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Journal of Water and Climate Change, 2021 The relation between sunspots and rainfall patterns is still obscure in Africa, especially for Sudan and South Sudan. This research explores the response of rainfall to solar activity in eastern regions of Africa, with a case study in Sudan and South ...
Mostafa A. Mohamed +1 more
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The Ratio Between the Number of Sunspot and the Number of Sunspot Groups [PDF]
Geomagnetism and Aeronomy, 2017 Data from three solar observatories, Learmonth, Holloman, and San Vito, are used to study the variations in the average number of sunspots per sunspot group. It is found that the different types of sunspot groups and the number of sunspots in these groups have different solar cycle and cycle to cycle variations.
Georgieva, K. +3 more
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