Zobrazeno 1 - 10
of 51
pro vyhledávání: '"H.-J. Opgenoorth"'
Autor:
O. Amm, E. F. Donovan, H. Frey, M. Lester, R. Nakamura, J. A. Wild, A. Aikio, M. Dunlop, K. Kauristie, A. Marchaudon, I. W. McCrea, H.-J. Opgenoorth, A. Strømme
Publikováno v:
Annales Geophysicae, Vol 23, Pp 2129-2170 (2005)
A little more than four years after its launch, the first magnetospheric, multi-satellite mission Cluster has already tremendously contributed to our understanding about the coupled solar wind - magnetosphere - ionosphere system. This is mostly du
Externí odkaz:
https://doaj.org/article/b56a132ebcb4402096e02d861729c223
Autor:
A. Schillings, L. Palin, H. J. Opgenoorth, M. Hamrin, L. Rosenqvist, J. W. Gjerloev, L. Juusola, R. Barnes
Publikováno v:
e2021SW002953
Space Weather
Space Weather
The physical magnetospheric cause for geomagnetically induced currents (GICs) are rapid time-varying magnetic fields (dB/dt), which occur mainly during magnetic substorms and storms. When, where and why exactly such rapid dB/dt may occur is insuffici
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::488f4ee98b80a539dc683282804c229a
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-196128
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-196128
Autor:
E. Borälv, H. J. Opgenoorth, K. Kauristie, M. Lester, J.-M. Bosqued, J. P. Dewhurst, C. J. Owen, M. Dunlop, J. A. Slavin, A. Fazakerley, C. Perry
Publikováno v:
Annales Geophysicae, Vol 23, Pp 997-1011 (2005)
We present a substorm event study using the four Cluster spacecraft in combination with ground-based instruments, in order to perform simultaneous observations in the ionosphere and magnetotail. We show good correlation between substorm signatures
Externí odkaz:
https://doaj.org/article/99edfd252694407da9c37259851e7208
Autor:
I. R. Mann, I. Voronkov, M. Dunlop, E. Donovan, T. K. Yeoman, D. K. Milling, J. Wild, K. Kauristie, O. Amm, S. D. Bale, A. Balogh, A. Viljanen, H. J. Opgenoorth
Publikováno v:
Annales Geophysicae, Vol 20, Pp 405-426 (2002)
We present magnetospheric observations of very large amplitude global scale ULF waves, from 9 and 10 December 2000 when the upstream solar wind speed exceeded 600 km/s. We characterise these ULF waves using ground-based magnetometer, radar and
Externí odkaz:
https://doaj.org/article/f2cf24fd1c57449aba24fc841df21c48
Autor:
K. Kauristie, T. I. Pulkkinen, O. Amm, A. Viljanen, M. Syrjäsuo, P. Janhunen, S. Massetti, S. Orsini, M. Candidi, J. Watermann, E. Donovan, P. Prikryl, I. R. Mann, P. Eglitis, C. Smith, W. F. Denig, H. J. Opgenoorth, M. Lockwood, M. Dunlop, A. Vaivads, M. André
Publikováno v:
Annales Geophysicae, Vol 19, Pp 1683-1696 (2001)
On 7 December 2000, during 13:30–15:30 UT the MIRACLE all-sky camera at Ny Ålesund observed auroras at high-latitudes (MLAT ~ 76) simultaneously when the Cluster spacecraft were skimming the magnetopause in the same MLT sector (at ~ 16:00–
Externí odkaz:
https://doaj.org/article/9a2789173b7a453daa91e4b81e0351a9
Publikováno v:
Annales Geophysicae, Vol 18, Pp 1097-1107 (2000)
We have investigated the time delay between substorm onset and related reactions in the dawn and dusk ionospheric electrojets, clearly separated from the nightside located substorm current wedge by several hours in MLT. We looked for substorm onse
Externí odkaz:
https://doaj.org/article/187a2d7668db4d63a6be65f2bc256909
Publikováno v:
Annales Geophysicae, Vol 18, Pp 99-110 (2000)
High time resolution data from the CUTLASS Finland radar during the interval 01:30-03:30 UT on 11 May, 1998, are employed to characterise the ionospheric electric field due to a series of omega bands extending ~5° in latitude at a resolution of 4
Externí odkaz:
https://doaj.org/article/6726bb15118d4e77b47f2e84e5b27e82
Autor:
K. Kauristie, T. I. Pulkkinen, A. Huuskonen, R. J. Pellinen, H. J. Opgenoorth, D. N. Baker, A. Korth, M. Syrjäsuo
Publikováno v:
Annales Geophysicae, Vol 15, Pp 967-983 (1997)
Rapid fading of auroral activity a few minutes before substorm breakup has earlier been analyzed in case-studies. Here we report on a study in which all-sky camera (ASC) and magnetic data over 3 years were examined to find breakups that were accom
Externí odkaz:
https://doaj.org/article/d4062bf714e64092bb10b9ab46af4b19
Publikováno v:
Annales Geophysicae, Vol 14, Pp 1177-1185 (1996)
The AE indices are generally used for monitoring the level of magnetic activity in the auroral oval region. In some cases, however, the oval is either so expanded or contracted that the latitudinal coverage of the AE magnetometer chain is not adeq
Externí odkaz:
https://doaj.org/article/a32d57a0116d4ba2bfe8b58604b1a8df
Publikováno v:
Annales Geophysicae, Vol 18, Pp 99-110 (2000)
Annales Geophysicae
Annales Geophysicae, European Geosciences Union, 2000, 18 (1), pp.99-110
Annales Geophysicae, Vol 18, Iss 1, Pp 99-110 (0000)
Annales Geophysicae
Annales Geophysicae, European Geosciences Union, 2000, 18 (1), pp.99-110
Annales Geophysicae, Vol 18, Iss 1, Pp 99-110 (0000)
High time resolution data from the CUTLASS Finland radar during the interval 01:30-03:30 UT on 11 May, 1998, are employed to characterise the ionospheric electric field due to a series of omega bands extending ~5° in latitude at a resolution of 45 k
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7e2088ebbff355f39d80210ec8b0c107
https://www.ann-geophys.net/18/99/2000/
https://www.ann-geophys.net/18/99/2000/