Zobrazeno 1 - 10
of 142
pro vyhledávání: '"I. Häggström"'
Publikováno v:
Annales Geophysicae, Vol 35, Pp 1143-1149 (2017)
Photo-electrons and secondary electrons from particle precipitation enhance the incoherent scatter plasma line to levels sufficient for detection. When detectable the plasma line gives accurate measure of the electron density and can potentially b
Externí odkaz:
https://doaj.org/article/b227fe902dae45679593ae23f3206dae
Autor:
B. Forte, N. D. Smith, C. N. Mitchell, F. Da Dalt, T. Panicciari, A. T. Chartier, D. Stevanovic, M. Vuckovic, J. Kinrade, J. R. Tong, I. Häggström, E. Turunen
Publikováno v:
Annales Geophysicae, Vol 31, Pp 745-753 (2013)
The impact of space weather events on satellite-based technologies (e.g. satellite navigation and precise positioning) is typically quantified on the basis of the total electron content (TEC) and temporal fluctuations associated with it. GNSS (glo
Externí odkaz:
https://doaj.org/article/1ad342887d3840d5800a14395adf97bc
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 475-491 (2006)
The ESRAD 52-MHz and the EISCAT 224-MHz radars in northern Scandinavia observed thin layers of strongly enhanced radar echoes from the mesosphere (Polar Mesosphere Winter Echoes - PMWE) during a solar proton event in November 2004. Using the inter
Externí odkaz:
https://doaj.org/article/e5e73a83cd61420abc00b8707176427c
Publikováno v:
Annales Geophysicae, Vol 23, Pp 1239-1247 (2005)
On 30 October 2004 during a strong solar proton event, layers of enhanced backscatter from altitudes between 55 and 75km have been observed by both ESRAD (52MHz) and the EISCAT VHF (224MHz) radars. These echoes have earlier been termed Polar Mesos
Externí odkaz:
https://doaj.org/article/ddaf7bdbfd0048d0bbe279cfb3cc762e
Publikováno v:
Annales Geophysicae, Vol 23, Pp 207-220 (2005)
A novel phase calibration technique for use with the multiple-frequency Range IMaging (RIM) technique is introduced based on genetic algorithms. The method is used on data collected with the European Incoherent SCATter (EISCAT) VHF radar during a
Externí odkaz:
https://doaj.org/article/fb440aec38334fc5a34f79272e3e4d8f
Publikováno v:
Annales Geophysicae, Vol 20, Pp 1469-1477 (2002)
The ionospheric D-layer is a narrow bandwidth radar target often with a very small scattering cross section. The target autocorrelation function can be obtained by transmitting a series of relatively short coded pulses and computing the correla
Externí odkaz:
https://doaj.org/article/89f4add88da44098948ebeaa6abafc8a
Publikováno v:
Annales Geophysicae, Vol 18, Pp 1599-1612 (2000)
During the summer of 1997 investigations into the nature of polar mesosphere summer echoes (PMSE) were conducted using the European incoherent scatter (EISCAT) VHF radar in Norway. The radar was operated in a frequency domain interferometry (FDI)
Externí odkaz:
https://doaj.org/article/c2722c55e2d746c0b2442b457262554d
Autor:
H. Y. Fu, M. L. Jiang, J. Vierinen, I. Häggström, M. T. Rietveld, E. Varberg, H. Sato, J. Wu, W. A. Scales, Y. Q. Jin
Publikováno v:
Geophysical Research Letters. 49
We report observations of stimulated electromagnetic emission (SEE) induced by high power high frequency (HF) radio waves near the third electron gyroharmonic (3urn:x-wiley:00948276:media:grl64672:grl64672-math-0022) at European Incoherent Scatter Ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::26f2a2de33969132862bb9897d016287
https://doi.org/10.1029/2022gl099390
https://doi.org/10.1029/2022gl099390
Autor:
T. D. Borisova, Michael T. Rietveld, N. F. Blagoveshchenskaya, A. S. Kalishin, M. I. Häggström
Publikováno v:
Radiophysics and Quantum Electronics. 62:793-806
We present the results of experimental studies of the generation peculiarities and features of the Langmuir and ion–acoustic turbulence in the F region of the high-latitude ionosphere excited by high-power HF O-mode radio waves emitted by the EISCA
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c3e0cbfb51aefb5502d57d6d5e27dca
https://doi.org/10.1007/s11141-020-10025-z
https://doi.org/10.1007/s11141-020-10025-z