Zobrazeno 1 - 10
of 24
pro vyhledávání: '"J. M. Weygand"'
Publikováno v:
Annales Geophysicae, Vol 41, Pp 13-37 (2023)
We have examined the most intense external (magnetospheric and ionospheric) and internal (induced) |dH/dt| (amplitude of the 10 s time derivative of the horizontal geomagnetic field) events observed by the high-latitude International Monitor for Auro
Externí odkaz:
https://doaj.org/article/55d81fba90d04fe0897cfb10b0c05e2b
Publikováno v:
Annales Geophysicae, Vol 40, Pp 619-639 (2022)
During minor to moderate geomagnetic storms, caused by corotating interaction regions (CIRs) at the leading edge of high-speed streams (HSSs), solar wind Alfvén waves modulated the magnetic reconnection at the dayside magnetopause. The Resolute Bay
Externí odkaz:
https://doaj.org/article/d56e0573fcdc4d99a29e4c7bdef1e87b
Publikováno v:
Annales Geophysicae, Vol 40, Pp 531-544 (2022)
Magnetotail earthward fast flow bursts can transport most magnetic flux and energy into the inner magnetosphere. These fast flow bursts are generally an order of magnitude higher than the typical convection speeds that are azimuthally localised (1–
Externí odkaz:
https://doaj.org/article/a6e123b4069047c8935adde6bfe2c367
Autor:
K.-J. Hwang, J. M. Weygand, D. G. Sibeck, J. L. Burch, M. L. Goldstein, C. P. Escoubet, E. Choi, K. Dokgo, B. L. Giles, C. J. Pollock, D. J. Gershman, C. T. Russell, R. J. Strangeway, R. B. Torbert
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
The solar wind-magnetosphere interaction drives diverse physical processes on the flanks of Earth’s magnetopause, and in turn these processes couple to the ionosphere. We investigate simultaneous multipoint in-situ spacecraft and ground-based measu
Externí odkaz:
https://doaj.org/article/bb5c8e000c9b4d78adb7c2f0bee1ea50
Publikováno v:
Earth, Planets and Space, Vol 72, Iss 1, Pp 1-10 (2020)
Abstract We examined how much large-scale and localized upward and downward currents contribute to the substorm current wedge (SCW), and how they evolve over time, using the THEMIS all-sky imagers (ASIs) and ground magnetometers. One type of events i
Externí odkaz:
https://doaj.org/article/3e8b47c77ce5491d951e199886019d27
Publikováno v:
Annales Geophysicae, Vol 35, Pp 1069-1083 (2017)
The presence of very few statistical studies on auroral omega bands motivated us to test-use a semi-automatic method for identifying large-scale undulations of the diffuse aurora boundary and to investigate their occurrence. Five identical all-sky
Externí odkaz:
https://doaj.org/article/02a415873477413ba81a9acf6cad38b1
Publikováno v:
Annales Geophysicae, Vol 29, Pp 2031-2043 (2011)
After the deep solar minimum at the end of the solar cycle 23, a small magnetic storm occurred on 20–26 January 2010. The Dst (disturbance storm time) index reached the minimum of −38 nT on 20 January and the prolonged recovery that followed th
Externí odkaz:
https://doaj.org/article/85ad5491ecc1495aa3fdb0fb8680c902
Autor:
M. Volwerk, J. Berchem, Y. V. Bogdanova, O. D. Constantinescu, M. W. Dunlop, J. P. Eastwood, P. Escoubet, A. N. Fazakerley, H. Frey, H. Hasegawa, B. Lavraud, E. V. Panov, C. Shen, J. K. Shi, M. G. G. T. Taylor, J. Wang, J. A. Wild, Q. H. Zhang, O. Amm, J. M. Weygand
Publikováno v:
Annales Geophysicae, Vol 29, Pp 1549-1569 (2011)
A study of the interaction of solar wind magnetic field rotations with the Earth's magnetosphere is performed. For this event there is, for the first time, a full coverage over the dayside magnetosphere with multiple (multi)spacecraft missions fro
Externí odkaz:
https://doaj.org/article/7dcda56a770c4cca812920528ab4b739
Autor:
A. Keiling, V. Angelopoulos, J. M. Weygand, O. Amm, E. Spanswick, E. Donovan, S. Mende, J. McFadden, D. Larson, K.-H. Glassmeier, H. U. Auster
Publikováno v:
Annales Geophysicae, Vol 27, Pp 4317-4332 (2009)
A simultaneous observation of an auroral spiral and its generator region in the near-Earth plasma sheet is rather unlikely. Here we present such observations using the THEMIS spacecraft as well as the THEMIS ground network of all-sky imagers and m
Externí odkaz:
https://doaj.org/article/8581f5e844354502a6d2ae8071207243
Autor:
B. Lavraud, M. F. Thomsen, S. Wing, M. Fujimoto, M. H. Denton, J. E. Borovsky, A. Aasnes, K. Seki, J. M. Weygand
Publikováno v:
Annales Geophysicae, Vol 24, Pp 3451-3465 (2006)
We report on the observation of two distinct cold (TiNi>2 cm−3) ion populations at geosynchronous orbit. A statistical study was performed on measurements from the geosynchronous Los Alamos plasma instruments, for the period 1990–2004, and co
Externí odkaz:
https://doaj.org/article/df6176946b3b4dedb3f1093c5e1c337c