Results 41 to 50 of about 5,646,026 (251)
A Recount of Sunspot Groups on Staudach’s Drawings [PDF]
Solar Physics, 2016 We have examined the more than 1100 drawings of the solar disk made by the German astronomy amateur Johann Caspar Staudach during 1749-1799 and counted the spots on each image. Using the modern perception of how to group spots into active regions we regrouped the spots as a modern observer would.
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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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Sunspot Count Periodicities in Different Zurich Sunspot Group Classes Since 1986 [PDF]
Solar Physics, 2014 Accepted Solar Physics ...
Kilcik, A. +3 more
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The Contribution of Large Recurrent Sunspot Groups to Solar Activity: Empirical Evidence
Universe, 2022 We identify large sunspot nestlets (SN) mostly containing recurrent sunspot groups and investigate the indices of solar activity defined as the 11- or 22-year moving average of the daily areas of the SN. These nestlets, 667 in total, are constructed from
Alexander Shapoval
doaj +1 more source
ON FLARE PREDICTABILITY BASED ON SUNSPOT GROUP EVOLUTION [PDF]
The Astrophysical Journal, 2015 The forecast method introduced by Korsós et al.(2014) is generalised from the horizontal magnetic gradient (GM), defined between two opposite polarity spots, to all spots within an appropriately defined region close to the magnetic neutral line of an active region.
M. B. Korsós +3 more
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Towards a Compositional Framework for Describing Human Phenotypes
Advanced Science, EarlyView.The Phenotype Assembly Method (PhenoAM) decomposes phenotype variables into measurable Features and typed Qualifiers, enabling standardized, machine‐readable Phenome Data Elements (PhenoDEs) that preserve measurement context. Applied in the International Human Phenome Project (IHPP), the framework yields 58 371 PhenoDEs and supports component‐level ...
Wanting Hu +11 more
wiley +1 more source
Katsue Misawa's sunspot data: sunspot group number and individual sunspot number
, 2023 These files show Katsue Misawa's sunspot observations with her 3-inch rafractor telescope from 1921 to 1934.
早川, 尚志 +3 more
core +1 more source
The Astrophysical Journal LettersSeveral recurrent X-class flares from Active Region (AR) 13664 triggered a severe G5-class geomagnetic storm between 2024 May 10 and 11. The morphology and compactness of this AR closely resemble the AR responsible for the famous Carrington Event of 1859.
P. Romano +3 more
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Sunspots sketches during the solar eclipses of 9th January and 29th December of 1777 in Mexico
Journal of Space Weather and Space Climate, 2017 Two sunspot observations recorded by the Mexican Felipe de Zúñiga y Ontiveros have been revealed from a manuscript. One sunspot group was recorded on 9th January 1777 and four sunspot groups on 29th December 1777.
Domínguez-Castro Fernando +2 more
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The Supergranular Pattern and the Stable Stages of Sunspot Groups [PDF]
Symposium - International Astronomical Union, 1968 Assuming the sunspot area to evolve smoothly and the sunspot-group lifetime distribution to be a monotonous decreasing function one can easily conclude that the function N(S), determining the number of sunspot groups having the area S at this moment, must increase monotonously and smoothly with decreasing area S.
M. G. Dmitrieva +2 more
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