Results 21 to 30 of about 3,012 (284)
ANALYSIS OF SUNSPOT NUMBER FLUCTUATIONS [PDF]
Fractals, 2004 Monthly averages of the sunspot number visible on the sun, observed from 1749, Zurich Observatory, and from 1848 other observatories, have been analyzed. This time signal presents a frequency power spectra with a clear 1/fα behavior with α≃0.8±0.2.
Fanchiotti, H. +3 more
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Von Lindener's sunspot data: sunspot group number and individual sunspot number
, 2023 Hayakawa et al. (2023) derived sunspot group number and individual sunspot number from von Liindener's records. These data have been extracted from von Lindener's manuscript (Akc.1985/15) in the Library of Wrocław University and Bode (1819).
早川, 尚志, Hayakawa, Hisashi
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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, Hayakawa, Hisashi
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An Overview of Sunspot Observations in the Early Maunder Minimum: 1645 – 1659
, 2023 Hayakawa et al. (2024) derived sunspot group number and individual sunspot number in the early Maunder Minimum. See their details in Hayakawa et al.
早川, 尚志, Hayakawa, Hisashi
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Nonparametric monitoring of sunspot number observations
, 2023 Solar activity is an important driver of long-term climate trends and must be accounted for in climate models. Unfortunately, direct measurements of this quantity over long periods do not exist.
Ritter, Christian +5 more
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Relation between Latitude-dependent Sunspot Data and Near-Earth Solar Wind Speed
The Astrophysical Journal, 2023 Solar wind is important for the space environment between the Sun and the Earth and varies with the sunspot cycle, which is influenced by solar internal dynamics.
Qirong Jiao +3 more
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Overlapping Magnetic Activity Cycles and the Sunspot Number: Forecasting Sunspot Cycle 25 Amplitude [PDF]
, 2020 The Sun exhibits a well-observed modulation in the number of spots on its disk over a period of about 11 years. From the dawn of modern observational astronomy, sunspots have presented a challenge to understanding—their quasi-periodic variation in number,
McIntosh, Scott W. +4 more
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Recalibration of the Sunspot-Number: Status Report
Solar Physics, 2023 AbstractWe report progress on the ongoing recalibration of the Wolf sunspot number ($S_{\mathrm{N}}$SN) and group-sunspot number ($G_{\mathrm{N}}$GN) following the release of version 2.0 of$S_{\mathrm{N}}$SNin 2015. This report constitutes both an update of the efforts reported in the 2016 Topical Issue of Solar Physics and a summary of work by the ...
Clette, F. +20 more
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HEMISPHERIC SUNSPOT UNIT AREA: COMPARISON WITH HEMISPHERIC SUNSPOT NUMBER AND SUNSPOT AREA
The Astronomical Journal, 2014 The monthly mean northern and southern hemispheric sunspot numbers (SNs) and sunspot areas (SAs) in the time interval of 1945 January to 2012 December are utilized to construct the monthly northern and southern hemispheric sunspot unit areas (SUAs), which are defined as the ratio of hemispheric SA to SN.
K. J. Li +3 more
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Maximum Sunspot Numbers and Active Days [PDF]
Journal of Astronomy and Space Sciences, 2013 Parameters associated with solar minimum have been studied to relate them to solar activity at solar maximum so that one could possibly predict behaviors of an upcoming solar cycle.
Heon-Young Chang
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