Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Nina V. Karachik"'
Autor:
Nina V. Karachik, Roger K. Ulrich, Kalevi Mursula, Alexei A. Pevtsov, Alexander Pevtsov, Elina Heikkinen, Luca Bertello, Ilpo Virtanen, Kseniya A. Tlatova, Andrey Tlatov
Context. Systematic observations of magnetic field strength and polarity in sunspots began at Mount Wilson Observatory (MWO), USA in early 1917. Except for a few brief interruptions, this historical dataset continues till present. Aims. The sunspot f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2d4224f5e9de2309f183c160e1f77de5
http://arxiv.org/abs/1907.06492
http://arxiv.org/abs/1907.06492
Autor:
Nina V. Karachik, Kalevi Mursula, K. A. Tlatova, Valeria V. Vasil’eva, Alexei A. Pevtsov, Andrey Tlatov, Alexander Pevtsov, Elina Heikkinen, Luca Bertello, Ilpo Virtanen
We use recently digitized sunspot drawings from Mount Wilson Observatory to investigate the latitudinal dependence of tilt angles of active regions and its change with solar cycle. The drawings cover the period from 1917 to present and contain inform
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e327c8a18104842ba315027b5a93389d
http://arxiv.org/abs/1807.07913
http://arxiv.org/abs/1807.07913
Publikováno v:
Proceedings of the International Astronomical Union. 6:343-346
Using maximum brightness of coronal bright point's (CBP) as a criterion, we separate them on two categories: dim CBPs, associated with areas of a quiet Sun, and bright CBPs, associated with an active Sun. This study reports on characteristics of two
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::891997276665e1670e6e63f9b9835e6b
https://doi.org/10.1017/s1743921311015511
https://doi.org/10.1017/s1743921311015511
Publikováno v:
The Astrophysical Journal. 714:1672-1678
We investigate the formation of isolated non-polar coronal holes (CHs) on the remnants of decaying active regions (ARs) at the minimum/early ascending phase of sunspot activity. We follow the evolution of four bipolar ARs and measure several paramete
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c338671aa915db59a865c3abce233f0c
https://doi.org/10.1088/0004-637x/714/2/1672
https://doi.org/10.1088/0004-637x/714/2/1672
Publikováno v:
Solar Physics. 262:321-335
We describe an automatic routine to identify coronal bright points (CBPs) and apply this routine to SOHO/EIT observations taken in the 195 A spectral range during solar cycle 23. We examine the total number of CBPs and its change in the course of thi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::18332b0e205c5da8e3b451f135605945
https://doi.org/10.1007/s11207-010-9524-5
https://doi.org/10.1007/s11207-010-9524-5
Autor:
Alexei A. Pevtsov, Nina V. Karachik
Publikováno v:
The Astrophysical Journal. 735:47
Observations of 108 coronal holes (CHs) from 1998-2008 were used to investigate the correlation between fast solar wind (SW) and several parameters of CHs. Our main goal was to establish the association between coronal bright points (CBPs; as sites o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b6bac47e6fbbdd1eb67c0ea83225f2ba
https://doi.org/10.1088/0004-637x/735/1/47
https://doi.org/10.1088/0004-637x/735/1/47