Zobrazeno 1 - 10
of 33
pro vyhledávání: '"R. Kerttula"'
Publikováno v:
Annales Geophysicae, Vol 22, Pp 643-651 (2004)
On 2 December 1999, the magnetometer stations in northern Finland registered structured Pc1 activity simultaneously in three distinct frequency bands. Using simultaneous EISCAT radar measurements of the high-latitude ionosphere, we have studied the
Externí odkaz:
https://doaj.org/article/4dba599b27494123879b04ef82abafef
Autor:
Daniel N. Baker, Kalevi Mursula, Manuel Grande, J. F. Fennell, R. Kerttula, J. B. Blake, R. H. W. Friedel, Finn Søraas, Timo Asikainen
Publikováno v:
Advances in Space Research. 36:1835-1839
We study the global properties of energetic (>30 keV) particles during the main and early recovery phase of a major magnetic storm of March 31, 2001, using data of the NOAA 15 and 16 and the CLUSTER satellites. During the storm main phase the ring cu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f1088561592acf8fa6c8b21d0b4a2f92
https://doi.org/10.1016/j.asr.2004.03.023
https://doi.org/10.1016/j.asr.2004.03.023
Autor:
R. H. W. Friedel, P. W. Daly, Manuel Grande, Timo Asikainen, M. Carter, Andris Vaivads, R. Kerttula, Theodore A. Fritz, Kalevi Mursula, J. F. Fennell, Finn Søraas, André Balogh
Publikováno v:
Advances in Space Research. 36:1904-1908
We study the energetic electrons by the Cluster-II Rapid instrument on a dayside high-latitude pass on the night between March 21/22, 2001. The Cluster satellites were flying outward in the pre-noon sector, passing a cusp/cleft type region roughly at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::44f11f5fc1b6ee94627df39fb3d7962d
https://doi.org/10.1016/j.asr.2004.03.021
https://doi.org/10.1016/j.asr.2004.03.021
Autor:
R. Kerttula, K. Prikner
Publikováno v:
Studia Geophysica et Geodaetica. 49:127-139
The significance of the O+-ion density altitude profile of the outer ionosphere for determination of the Ionospheric Alfven Resonator (IAR) lower harmonic structure has been demonstrated. The O+-reduced and exponentially extrapolated ionosphere model
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2b3dd1019843cc973133060293c2200b
https://doi.org/10.1007/s11200-005-1629-1
https://doi.org/10.1007/s11200-005-1629-1
Publikováno v:
Studia Geophysica et Geodaetica. 46:507-526
The ionospheric Alfven resonator (IAR) was numerically simulated under non-stationary ionospheric and magnetospheric conditions of the IPDP event of December 4, 1986. The full numerical wave method was applied using height profiles of the ionospheric
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74bd715bea99934ac5ffe367f3800929
https://doi.org/10.1023/a:1019543119050
https://doi.org/10.1023/a:1019543119050
Publikováno v:
Journal of Geophysical Research: Space Physics. 106:6213-6227
We study structured and unstructured Pc1 pulsations observed at a high-latitude station (Sodankyla; L = 5.1) and a midlatitude station (Nurmijarvi; L = 3.3) during 18 storms occurring in low solar activity years (1976–1978 and 1984–1988). Pc1 act
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::036d363e81dc04357ccd718f58653086
https://doi.org/10.1029/2000ja900125
https://doi.org/10.1029/2000ja900125
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 63:503-511
We study the properties of structured and unstructured Pc1 pulsations at a high-latitude station (Sodankyla; L =5.1) and a mid-latitude station (Nurmijarvi; L =3.3) during 18 storms occurring in low solar activity years. The storms were divided into
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7ad6b9a13de819c1f2fe17a827569217
https://doi.org/10.1016/s1364-6826(00)00172-3
https://doi.org/10.1016/s1364-6826(00)00172-3
Autor:
O. A. Pokhotelov, V. Vagner, Jorma Kangas, Karel Prikner, F. Z. Feygin, T. Pikkarainen, Kalevi Mursula, R. Kerttula
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 62:311-322
A Pc1/IPDP event recorded by the Finnish search coil magnetometers on 15 December 1984 was analyzed in a companion paper (Mursula et al., 2000. Non-stationary Alfven resonator: new results on Pc1 pearls and IPDP events. J. Atmos. Solar-Terr. Phys. 62
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::264dbe9951e12529de2f5980719bac37
https://doi.org/10.1016/s1364-6826(99)00126-1
https://doi.org/10.1016/s1364-6826(99)00126-1
Autor:
Timo Braysy, Karel Prikner, Kalevi Mursula, T. Pikkarainen, O. A. Pokhotelov, P. Pollari, R. Kerttula, Jorma Kangas, F. Z. Feygin
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 62:299-309
We analyse a Pc1 pearl event observed by the Finnish search-coil magnetometer network on 15 December 1984, which subsequently developed into a structured IPDP after a substorm onset. The EISCAT radar was simultaneously monitoring the mid- to high-lat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c2b82e6f79421e980dd5108e8b92f80
https://doi.org/10.1016/s1364-6826(99)00124-8
https://doi.org/10.1016/s1364-6826(99)00124-8
Autor:
Kalevi Mursula, Alexander Potapov, Jorma Kangas, O. A. Pokhotelov, Anatol Guglielmi, R. Kerttula, T. Pikkarainen
Publikováno v:
Journal of Geophysical Research: Space Physics. 104:12399-12406
In this paper we study structured Pc1 pulsations (also called Pc1 pearls) observed on ground, concentrating on the relation between the pearl repetition period τ and the wave frequency f. Earlier studies suggest that the product τ f is roughly cons
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::454a12de1c76b18327433bdadb916756
https://doi.org/10.1029/1999ja900055
https://doi.org/10.1029/1999ja900055