Zobrazeno 1 - 10
of 1 951
pro vyhledávání: '"A. Usoskin"'
Autor:
Vasilyev, Valeriy, Reinhold, Timo, Shapiro, Alexander I., Usoskin, Ilya, Krivova, Natalie A., Maehara, Hiroyuki, Notsu, Yuta, Brun, Allan Sacha, Solanki, Sami K., Gizon, Laurent
Publikováno v:
SCIENCE 12 Dec 2024; Vol 386, Issue 6727, pp. 1301-1305
Stellar superflares are energetic outbursts of electromagnetic radiation, similar to solar flares but releasing more energy, up to $10^{36}$ erg on main sequence stars. It is unknown whether the Sun can generate superflares, and if so, how often they
Externí odkaz:
http://arxiv.org/abs/2412.12265
We describe the defining observations of the solar cycle that provide constraints for the dynamo processes operating within the Sun. Specifically, we report on the following topics: historical sunspot numbers and revisions; active region (AR) flux ra
Externí odkaz:
http://arxiv.org/abs/2305.19803
Solar activity has a cyclic nature with the ~11-year Schwabe cycle dominating its variability on the interannual timescale. However, solar cycles are significantly modulated in length, shape and magnitude, from near-spotless grand minima to very acti
Externí odkaz:
http://arxiv.org/abs/2302.14845
Autor:
Clette, F., Lefèvre, L., Chatzistergos, T., Hayakawa, H., Carrasco, V. M., Arlt, R., Cliver, E. W., de Wit, T. Dudok, Friedli, T., Karachik, N., Kopp, G., Lockwood, M., Mathieu, S., Muñoz-Jaramillo, A., Owens, M., Pesnell, D., Pevtsov, A., Svalgaard, L., Usoskin, I. G., van Driel-Gesztelyi, L., Vaquero, J. M.
We report progress on the ongoing recalibration of the Wolf sunspot number (SN) and Group sunspot number (GN) following the release of version 2.0 of SN in 2015. This report constitutes both an update of the efforts reported in the 2016 Topical Issue
Externí odkaz:
http://arxiv.org/abs/2301.02084
Autor:
Nandy, Dibyendu, Banerjee, Dipankar, Bhowmik, Prantika, Brun, Allan Sacha, Cameron, Robert H., Gibson, S. E., Hanasoge, Shravan, Harra, Louise, Hassler, Donald M., Jain, Rekha, Jiang, Jie, Jouve, Laurène, Mackay, Duncan H., Mahajan, Sushant S., Mandrini, Cristina H., Owens, Mathew, Pal, Shaonwita, Pinto, Rui F., Saha, Chitradeep, Sun, Xudong, Tripathi, Durgesh, Usoskin, Ilya G.
Despite investments in multiple space and ground-based solar observatories by the global community, the Sun's polar regions remain unchartered territory - the last great frontier for solar observations. Breaching this frontier is fundamental to under
Externí odkaz:
http://arxiv.org/abs/2301.00010
Autor:
Vasilyev, Valeriy, Reinhold, Timo, Shapiro, Alexander I., Krivova, Natalie A., Usoskin, Ilya, Montet, Benjamin T., Solanki, Sami K., Gizon, Laurent
Publikováno v:
A&A 668, A167 (2022)
Over the past years, thousands of stellar flares have been detected by harvesting data from large photometric surveys. These detections, however, do not account for potential sources of contamination such as background stars appearing in the same ape
Externí odkaz:
http://arxiv.org/abs/2209.13903
Magnetic fields generated in the Sun's interior by the solar dynamo mechanism drive solar activity over a range of time-scales. While space-based observations of the Sun's corona exist only for few decades, direct sunspot observations exist for a few
Externí odkaz:
http://arxiv.org/abs/2208.12103
Autor:
Owens, Mathew, Barnard, Luke, Pope, Benjamin, Lockwood, Mike, Usoskin, Ilya, Asvestari, Eleanna
Severe geomagnetic storms appear to be ordered by the solar cycle in a number of ways. They occur more frequently close to solar maximum and declining phase, are more common in larger solar cycles and show different patterns of occurrence in odd- and
Externí odkaz:
http://arxiv.org/abs/2207.12787
Publikováno v:
Living Rev Sol Phys 19, 2 (2022)
We trace the evolution of research on extreme solar and solar-terrestrial events from the 1859 Carrington event to the rapid development of the last twenty years. Our focus is on the largest observed/inferred/theoretical cases of sunspot groups, flar
Externí odkaz:
http://arxiv.org/abs/2205.09265
Autor:
Mishev, Alexander, Larsen, Nicholas, Asvestari, Eleanna, Sáiz, Alejandro, Ann Shea, Margaret, Strauss, Du Toit, Ruffolo, David, Banglieng, Chanoknan, Seunarine, Surujhdeo, Duldig, Marc L., Gil, Agnieszka, Blanco, Juan José, García-Población, Oscar, Cervino-Solana, Pablo, Adams, Jr., James H., Usoskin, Ilya
Publikováno v:
In Advances in Space Research 15 October 2024 74(8):4160-4172
