Zobrazeno 1 - 8
of 8
pro vyhledávání: '"Vanhamäki, H. (H.)"'
Autor:
Laundal, K. M. (K. M.), Yee, J. H. (J. H.), Merkin, V. G. (V. G.), Gjerloev, J. W. (J. W.), Vanhamäki, H. (H.), Reistad, J. P. (J. P.), Madelaire, M. (M.), Sorathia, K. (K.), Espy, P. J. (P. J.)
The auroral electrojet is traditionally measured remotely with magnetometers on ground or in low Earth orbit (LEO). The sparse distribution of measurements, combined with a vertical distance of some 100 km to ground and typically >300 km to LEO satel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::fc87b7da676d6177c54499b17372427b
http://urn.fi/urn:nbn:fi-fe2021062940565
http://urn.fi/urn:nbn:fi-fe2021062940565
We present a statistical investigation of the effects of interplanetary magnetic field (IMF) on hemispheric asymmetry in auroral currents. Nearly 6 years of magnetic field measurements from Swarm A and C satellites are analyzed. Bootstrap resampling
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::d6500236cd593dd1482a61cda8cc91b7
http://urn.fi/urn:nbn:fi-fe202201132283
http://urn.fi/urn:nbn:fi-fe202201132283
We present a statistical investigation of the seasonal effect on hemispheric asymmetry in the auroral currents during low (Kp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::251e81c5918095954e5356e8a8cfd782
http://urn.fi/urn:nbn:fi-fe2020120299023
http://urn.fi/urn:nbn:fi-fe2020120299023
Autor:
Oyama, S. (S.), Shinbori, A. (A.), Ogawa, Y. (Y.), Kellinsalmi, M. (M.), Raita, T. (T.), Aikio, A. (A.), Vanhamäki, H. (H.), Shiokawa, K. (K.), Virtanen, I. (I.), Cai, L. (L.), Workayehu, A. B. (A. B.), Pedersen, M. (M.), Kauristie, K. (K.), Tsuda, T. T. (T. T.), Kozelov, B. (B.), Demekhov, A. (A.), Yahnin, A. (A.), Tsuchiya, F. (F.), Kumamoto, A. (A.), Kasahara, Y. (Y.), Matsuoka, A. (A.), Shoji, M. (M.), Teramoto, M. (M.), Lester, M. (M.)
Various subauroral optical features have been studied by analyzing data collected during periods of geomagnetic disturbances. Most events have been typically found at geomagnetic latitudes of 45–60°. In this study, however, we present a red arc ev
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::a5574d33587204b1820c12bfb59d6daa
http://vt.superdarn.org/tiki-index.php?page=ASCIIData
http://vt.superdarn.org/tiki-index.php?page=ASCIIData
We present statistical investigation of the high‐latitude ionospheric current systems in the Northern Hemisphere (NH) and Southern Hemisphere (SH) during low (Kp < 2) and high (Kp ≥ 2) geomagnetic activity levels. Nearly 4 years of vector magneti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::8b02b8bd76bb1e99e2d16d06ee731ba4
http://urn.fi/urn:nbn:fi-fe2019100731422
http://urn.fi/urn:nbn:fi-fe2019100731422
The high‐latitude ionosphere‐thermosphere system is strongly affected by the magnetospheric energy input during magnetospheric substorms. In this study, we investigate the response of the upper thermospheric winds to four substorm events by using
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::080a2bbd454fe9915d9750ac6abfec2c
http://urn.fi/urn:nbn:fi-fe2019092329512
http://urn.fi/urn:nbn:fi-fe2019092329512
Autor:
Aikio, A. T. (A. T.), Vanhamäki, H. (H.), Workayehu, A. B. (A. B.), Virtanen, I. I. (I. I.), Kauristie, K. (K.), Juusola, L. (L.), Buchert, S. (S.), Knudsen, D. (D.)
We present Swarm satellite and EISCAT radar observations of electrodynamical parameters in the midnight sector at high latitudes. The most striking feature is a plasma flow channel located equatorward of the polar cap boundary within the dawn convect
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::1735cc0c7668e388100e015b1d191601
http://urn.fi/urn:nbn:fi-fe201902215928
http://urn.fi/urn:nbn:fi-fe201902215928
Autor:
Alken, P. (P.), Maute, A. (A.), Richmond, A. D. (A. D.), Vanhamäki, H. (H.), Egbert, G. D. (G. D.)
Ionospheric currents are driven by several different physical processes and exhibit complex spatial and temporal structure. Magnetic field measurements of ionospheric sources are often spatially sparse, causing significant challenges in visualizing c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::ce95f3505ec2003ab5566ce3a5a08fbb
http://urn.fi/urn:nbn:fi-fe201706267462
http://urn.fi/urn:nbn:fi-fe201706267462