Zobrazeno 1 - 10
of 77
pro vyhledávání: '"L A, Blomberg"'
Publikováno v:
Annales Geophysicae, Vol 27, Pp 3335-3347 (2009)
We examine 14 cases of an interesting type of extremely high latitude aurora as identified in the precipitating particles measured by the DMSP F13 satellite. In particular we investigate structures within large-scale arcs for which the particle si
Externí odkaz:
https://doaj.org/article/90e028ea7c6c4025a73c7cae3cc1d589
Autor:
S. Schäfer, K. H. Glassmeier, P. T. I. Eriksson, P. N. Mager, V. Pierrard, K. H. Fornaçon, L. G. Blomberg
Publikováno v:
Annales Geophysicae, Vol 26, Pp 1805-1817 (2008)
A case study of a poloidal ULF pulsation near the dayside plasmapause is presented based on Cluster observations of magnetic and electric fields. The pulsation is detected close to the magnetic equatorial plane at L shells L=[4.4, 4.6] and oscill
Externí odkaz:
https://doaj.org/article/8b87ba16ef7343fdac75eee2ada9a134
Publikováno v:
Annales Geophysicae, Vol 26, Pp 1567-1579 (2008)
The overall focus on the driver of toroidal Pc5 waves has been on processes located at or acting on the dayside magnetopause and dayside flanks of the magnetosphere. These processes can generate waves that propagate tailward in the magnetosphere. H
Externí odkaz:
https://doaj.org/article/0b6128698aed425fa5e819285ac4f429
Publikováno v:
Annales Geophysicae, Vol 25, Pp 1011-1024 (2007)
Oscillating magnetic field lines are frequently observed by spacecraft in the terrestrial and other planetary magnetospheres. The CLUSTER mission is a very suitable tool to further study these Alfvén waves as the four CLUSTER spacecraft provide f
Externí odkaz:
https://doaj.org/article/fcce29c5dbd44d70982f7f66beaa3b64
Autor:
I. I. Alexeev, E. S. Belenkaya, S. Yu. Bobrovnikov, V. V. Kalegaev, J. A. Cumnock, L. G. Blomberg
Publikováno v:
Annales Geophysicae, Vol 25, Pp 2615-2625 (2007)
We study the topological structure of the magnetosphere for northward IMF. Using a magnetospheric magnetic field model we study the high-latitude response to prolonged periods of northward IMF. For forced solar wind conditions we investigate the l
Externí odkaz:
https://doaj.org/article/28433b94c0fa400fb18debc32f16bfcf
Publikováno v:
Annales Geophysicae, Vol 24, Pp 3161-3172 (2006)
We study the onset and development of an ultra low frequency (ULF) pulsation excited by a storm sudden commencement. On 30 August 2001, 14:10 UT, the Cluster spacecraft are located in the dayside magnetosphere and observe the excitation of a ULF pu
Externí odkaz:
https://doaj.org/article/a3f0c9805c934927ad01d8e2ed0127b0
Publikováno v:
Annales Geophysicae, Vol 24, Pp 2719-2733 (2006)
Observations of Pi2 pulsations at middle and low latitudes have been explained in terms of cavity mode resonances, whereas transients associated with field-aligned currents appear to be responsible for the high latitude Pi2 signature. Data fr
Externí odkaz:
https://doaj.org/article/d8cf2c88b53b4917942d928b7f35dfd5
Autor:
Y. I. Feldstein, V. A. Popov, J. A. Cumnock, A. Prigancova, L. G. Blomberg, J. U. Kozyra, B. T. Tsurutani, L. I. Gromova, A. E. Levitin
Publikováno v:
Annales Geophysicae, Vol 24, Pp 2243-2276 (2006)
We investigate variations in the location and intensity of the auroral electrojets during magnetic storms and substorms using a numerical method for estimating the equivalent ionospheric currents based on data from meridian chains of magnetic obse
Externí odkaz:
https://doaj.org/article/9ab594d22be442c7ae7f1bec9681812f
Publikováno v:
Annales Geophysicae, Vol 23, Pp 2679-2686 (2005)
Three ULF wave events, all occurring in the dayside magnetopshere during magnetically quiet times, are studied using the Cluster satellites. The multi-point measurements obtained from Cluster are used to determine the azimuthal wave number for the
Externí odkaz:
https://doaj.org/article/a455d5333bd84bc1b98a7a11d57fe075
Publikováno v:
Annales Geophysicae, Vol 23, Pp 1797-1806 (2005)
We study the wave-related (AC) and static (DC) parallel Poynting vector (Poynting energy flux) as a function of altitude in auroral field lines using Polar EFI and MFE data. The study is statistical and contains 5 years of data in the altitude ran
Externí odkaz:
https://doaj.org/article/d6b333e3ddbc48089aa2e9effabdced1