Zobrazeno 1 - 10
of 24
pro vyhledávání: '"S. C. Buchert"'
Publikováno v:
Annales Geophysicae, Vol 39, Pp 277-288 (2021)
This study analyses the observations of a new type of small-scale aurora-like feature, which is further referred to as fragmented aurora-like emission(s) (FAEs). An all-sky camera captured these FAEs on three separate occasions in 2015 and 2017 at th
Externí odkaz:
https://doaj.org/article/ddb1ab5692d84fb39f0924d140d85926
Autor:
S. C. Buchert
Publikováno v:
Annales Geophysicae, Vol 38, Pp 1019-1030 (2020)
The Earth's neutral atmosphere is the driver of the well-known solar quiet (Sq) and other magnetic variations observed for more than 100 years. Yet the understanding of how the neutral wind can accomplish a dynamo effect has been incomplete. A new vi
Externí odkaz:
https://doaj.org/article/86256070140e4a5ab1faf337f362195f
Autor:
O. Amm, A. Aruliah, S. C. Buchert, R. Fujii, J. W. Gjerloev, A. Ieda, T. Matsuo, C. Stolle, H. Vanhamäki, A. Yoshikawa
Publikováno v:
Annales Geophysicae, Vol 26, Pp 3913-3932 (2008)
Traditionally, due to observational constraints, ionospheric modelling and data analysis techniques have been devised either in one dimension (e.g. along a single radar beam), or in two dimensions (e.g. over a network of magnetometers). With new u
Externí odkaz:
https://doaj.org/article/bc2c852883a749738f6ac09c43e7c267
Publikováno v:
Annales Geophysicae, Vol 26, Pp 2837-2844 (2008)
Observations by the EISCAT Svalbard radar show that electron temperatures Te in the cusp electrojet reach up to about 4000 K. The heat is tapped and converted from plasma convection in the near Earth space by a Pedersen current that is carried
Externí odkaz:
https://doaj.org/article/0cb09b3c78ce40149cb5db56cb228898
Autor:
K. G. Tanaka, A. Retinò, Y. Asano, M. Fujimoto, I. Shinohara, A. Vaivads, Y. Khotyaintsev, M. André, M. B. Bavassano-Cattaneo, S. C. Buchert, C. J. Owen
Publikováno v:
Annales Geophysicae, Vol 26, Pp 2471-2483 (2008)
The magnetopause (MP) reconnection is characterized by a density asymmetry across the current sheet. The asymmetry is expected to produce characteristic features in the reconnection layer. Here we present a comparison between the Cluster MP crossi
Externí odkaz:
https://doaj.org/article/c13beceb770e4af2aeb5d08d1633060f
Autor:
J. Lunde, S. C. Buchert, Y. Ogawa, M. Hirahara, K. Seki, Y. Ebihara, T. Sakanoi, K. Asamura, M. Okada, T. Raita, I. Häggström
Publikováno v:
Annales Geophysicae, Vol 26, Pp 2485-2502 (2008)
We present results from co-ordinated measurements with the low altitude REIMEI satellite and the ESR (EISCAT Svalbard Radar), together with other ground-based instruments carried out in February 2006. The results mainly relate to the dayside cusp
Externí odkaz:
https://doaj.org/article/695a36fd8cbe4ec18d55391bb2bc9a41
Publikováno v:
Annales Geophysicae, Vol 24, Pp 3351-3364 (2006)
Naturally enhanced ion-acoustic lines (NEIALs) between 1200 and 1900 km altitude are investigated. The NEIALs were found in the background gates of data from the European Incoherent Scatter (EISCAT) Svalbard radar (ESR) at 78° N looking field-ali
Externí odkaz:
https://doaj.org/article/e1a3f1779c794c4da759e1d9d998e6e0
Autor:
D. Sundkvist, A. Vaivads, M. André, J.-E. Wahlund, Y. Hobara, S. Joko, V. V. Krasnoselskikh, Y. V. Bogdanova, S. C. Buchert, N. Cornilleau-Wehrlin, A. Fazakerley, J.-O. Hall, H. Rème, G. Stenberg
Publikováno v:
Annales Geophysicae, Vol 23, Pp 983-995 (2005)
We present a detailed study of waves with frequencies near the proton gyrofrequency in the high-altitude cusp for northward IMF as observed by the Cluster spacecraft. Waves in this regime can be important for energization of ions and electrons and
Externí odkaz:
https://doaj.org/article/6990186b1f614e1a9e0740942603bbc7
Publikováno v:
Annales Geophysicae, Vol 22, Pp 889-899 (2004)
We report on observations of a diverging ion flow along the geomagnetic field that is often seen at the EISCAT Svalbard radar. The flow is upward above the peak of the electron density in the F-region and downward below the peak. We estimate that
Externí odkaz:
https://doaj.org/article/431d73afa799422dbb6ec94a607e0723
Publikováno v:
Annales Geophysicae, Vol 20, Pp 1311-1320 (2002)
We present EISCAT Svalbard Radar and DMSP observations of a double cusp during an interval of predominantly northward IMF on 26 November 2000. In the cusp region, the ESR dish, pointing northward, recorded sun-ward ionospheric flow at high lati
Externí odkaz:
https://doaj.org/article/5308f87d6efe4086ab54ca54e0927e0f