Results 11 to 20 of about 1,269 (230)
A Unified Shape Model For Sunspot Number Cycles
Ratio Mathematica, 2021 Modelling and prediction of sunspot number time series is an unavoidable activity in the space object re-entry prediction community. Different mathematical functions have been proposed in the literature as sunspot number cycle model, since the McNish ...
GP Beena, A Sabarinath, AK Anilkumar
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Ratio Mathematica, 2020 The 11 year sunspot number cycle has been a fascinating phenomenon for many scientists in the last three centuries. Various mathematical functions have been used for modelling the 11 year sunspot number cycles.
Amaranathan Sabarinath +2 more
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Long-term solar activity explored with wavelet methods [PDF]
Annales Geophysicae, 2006 Long-term solar activity has been studied with a set of wavelet methods. The following indicators of long-term solar activity were used; the group sunspot number, the sunspot number, and the 14C production rate.
H. Lundstedt +3 more
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Change of Sunspot Groups Observed from 2002 to 2011 at ButterStar Observatory [PDF]
Journal of Astronomy and Space Sciences, 2012 Since the development of surface magnetic features should reflect the evolution of the solar magnetic field in the deep interior of the Sun, it is crucial to study properties of sunspots and sunspot groups to understand the physical processes working ...
Sung-Jin Oh, Heon-Young Chang
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The Astrophysical Journal Supplement Series, 2023 In this paper, an optimized long short-term memory model is proposed to deal with the smoothed monthly F _10.7 and nonsmoothed monthly sunspot area (SSA) data, aiming to forecast the peak amplitude of both solar activities and the occurring time for ...
Hongbing Zhu +3 more
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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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Centennial Total Solar Irradiance Variation
Remote Sensing, 2022 Total Solar Irradiance (TSI) quantifies the solar energy received by the Earth and therefore is of direct relevance for a possible solar influence on climate change on Earth.
Steven Dewitte +2 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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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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