Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Yury A. Nagovitsyn"'
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 501:2782-2789
We use the Catalogue of Solar Activity (CSA) to study the latitudinal variations of tilt of solar active regions. The tilt angles β are computed taking into account changes of the heliographic grid with latitude φ. We show that when sunspot groups
Autor:
Yury A. Nagovitsyn, A. A. Osipova
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 492:1914-1918
The IDV index of geomagnetic activity is used by many researchers as a proxy of the interplanetary magnetic field (IMF) strength B. Using the original multiscale regression (MSR) method based on wavelet transformation, we obtained a long series of B
Autor:
Yury A. Nagovitsyn, A. A. Osipova
The aim of this work is to create a long (410-yr) series of average annual total sunspot areas AR – a physically based index of sunspot activity. We use telescopic observations of the AR index in 1832–1868 and 1875–2020, as well as the relation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6288299ee1d73d7035208e4bdda352bb
http://arxiv.org/abs/2105.06519
http://arxiv.org/abs/2105.06519
Publikováno v:
Journal of Space Weather and Space Climate, Vol 11, p 4 (2021)
We briefly review the history of observations of magnetic fields on the Sun, and describe early magnetograps for full disk measurements. Changes in instruments and detectors, the cohort of observers, the knowledge base etc may result in non-uniformit
Publikováno v:
Astronomische Nachrichten. 338:26-34
Using observations of sunspot magnetic field strengths (H) from the Crimean Astrophysical Observatory (CrAO) and area (S) of sunspots from the Kislovodsk Mountain Astronomical Station of Pulkovo Observatory, we investigate the changes in the relation
Early telescopic observations of sunspots were conducted with instruments of relatively small aperture. These instruments also suffered from a higher level of scattered light, and the human eye served as a "detector". The eye's ability to resolve sma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0eac6343a784a66e85c1531ba286c7b
http://arxiv.org/abs/1907.04932
http://arxiv.org/abs/1907.04932
Autor:
Yury A. Nagovitsyn, Alexei A. Pevtsov
Publikováno v:
The Astrophysical Journal. 906:27
Autor:
Yury A. Nagovitsyn, Alexei A. Pevtsov
Publikováno v:
The Astrophysical Journal. 888:L26
Publikováno v:
Geochronometria. 41:216-222
Radiocarbon 14C is a cosmogenic isotope, which is most extensively used by scientists from a wide variety of fields. Its rate of generation in the atmosphere depends on solar modulation and thus, studying 14C concentration in natural archives, one ca
Autor:
Andrey Tlatov, Ali Kilcik, Edward W. Cliver, Luca Bertello, Yury A. Nagovitsyn, Alexei A. Pevtsov
Publikováno v:
Solar Physics. 289:593-602
Measurements from the Mount Wilson Observatory (MWO) are used to study the long-term variations of sunspot field strengths from 1920 to 1958. Following a modified approach similar to that in Pevtsov et al. (2011), for each observing week we select a