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pro vyhledávání: '"Clette, Frederic"'
The McNish and Lincoln (ML) method, introduced in 1949, was one of the first attempts to produce mid-term forecasts of solar activity, up to 12 months ahead. However, it has been poorly described and evaluated in the past literature, in particular it
Externí odkaz:
http://arxiv.org/abs/2402.09273
Autor:
Clette, Frédéric
Publikováno v:
Journal of Space Weather and Space Climate, Volume 11, id.2, 25 pp., 2021
The $F_{10.7cm}$ radio flux and the Sunspot Number are the most widely used long-term indices of solar activity. They are strongly correlated, which led to the publication of many proxy relations allowing to convert one index onto the other. However,
Externí odkaz:
http://arxiv.org/abs/2301.02588
Publikováno v:
Solar Physics, Volume 296, Issue 9, article id.137, 2021
The recalibration of the sunspot number series, the primary long-term record of the solar cycle, requires the recovery of the entire collection of raw sunspot counts collected by the Zurich Observatory for the production of this index between 1849 an
Externí odkaz:
http://arxiv.org/abs/2301.02429
Publikováno v:
Solar Physics, 2023
The focus of this study is to reveal the reason behind a scale problem detected around 1849 in the historical version of the International Sunspot Number Series, i.e. version 1 (Leussu et al, Astronomy and Astrophysics, 559, A28, 2013; Friedli, Solar
Externí odkaz:
http://arxiv.org/abs/2210.03362
Autor:
Podladchikova, Tatiana, Jain, Shantanu, Veronig, Astrid M., Sutyrina, Olga, Dumbovic, Mateja, Clette, Frederic, Poetzi, Werner
Publikováno v:
A&A 663, A88 (2022)
Forecasting the solar cycle amplitude is important for a better understanding of the solar dynamo as well as for many space weather applications. We demonstrated a steady relationship between the maximal growth rate of sunspot activity in the ascendi
Externí odkaz:
http://arxiv.org/abs/2206.12606
Publikováno v:
A&A 652, A56 (2021)
We create a continuous series of daily and monthly hemispheric sunspot numbers (HSNs) from 1874 to 2020, which will be continuously expanded in the future with the HSNs provided by SILSO. Based on the available daily measurements of hemispheric sunsp
Externí odkaz:
http://arxiv.org/abs/2107.00553
Autor:
Mathieu, Sophie, Lefèvre, Laure, von Sachs, Rainer, Delouille, Véronique, Ritter, Christian, Clette, Frédéric
Publikováno v:
Journal of Quality Technology, Apr. 2022
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. The only observation related to solar activity whose re
Externí odkaz:
http://arxiv.org/abs/2106.13535
Autor:
Hayakawa, Hisashi, Clette, Frédéric, Horaguchi, Toshihiro, Iju, Tomoya, Knipp, Delores J., Liu, Huixin, Nakajima, Takashi
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 3, p.4513-4527, 2020
The sunspot record is the only observational tracer of solar activity that provides a fundamental, multi-century reference. Its homogeneity has been largely maintained with a succession of long-duration visual observers. In this paper, we examine obs
Externí odkaz:
http://arxiv.org/abs/1911.12702
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Autor:
Pevtsov, Alexei, Griffin, Elizabeth, Grindlay, Jonathan, Kafka, Stella, Bartlett, Jennifer Lynn, Usoskin, Ilya, Mursula, Kalevi, Gibson, Sarah, Pillet, Valentin M., Burkepile, Joan, Webb, David, Clette, Frederic, Hesser, James, Stetson, Peter, Munoz-Jaramillo, Andres, Hill, Frank, Bogart, Rick, Osborn, Wayne, Longcope, Dana
Publikováno v:
White Paper, ASTRO2020 Decadal Survey, 2020
Over the past decades and even centuries, the astronomical community has accumulated a signif-icant heritage of recorded observations of a great many astronomical objects. Those records con-tain irreplaceable information about long-term evolutionary
Externí odkaz:
http://arxiv.org/abs/1903.04839