Zobrazeno 1 - 10
of 173
pro vyhledávání: '"H. Gunell"'
Autor:
C. Goetz, H. Gunell, F. Johansson, K. LLera, H. Nilsson, K.-H. Glassmeier, M. G. G. T. Taylor
Publikováno v:
Annales Geophysicae, Vol 39, Pp 379-396 (2021)
The plasma around comet 67P/Churyumov–Gerasimenko showed remarkable variability throughout the entire Rosetta mission. Plasma boundaries such as the diamagnetic cavity, solar wind ion cavity and infant bow shock separate regions with distinct plasm
Externí odkaz:
https://doaj.org/article/7f9fe8b18da04989bcb1803da9b3ac55
Autor:
H. Gunell, C. Goetz, E. Odelstad, A. Beth, M. Hamrin, P. Henri, F. L. Johansson, H. Nilsson, G. Stenberg Wieser
Publikováno v:
Annales Geophysicae, Vol 39, Pp 53-68 (2021)
Ion acoustic waves were observed between 15 and 30 km from the centre of comet 67P/Churyumov–Gerasimenko by the Rosetta spacecraft during its close flyby on 28 March 2015. There are two electron populations: one cold at kBTe≈0.2 eV and one warm a
Externí odkaz:
https://doaj.org/article/6ed3d9aa75c94b919bccac4254fe0261
Autor:
A. Schillings, H. Gunell, H. Nilsson, A. De Spiegeleer, Y. Ebihara, L. G. Westerberg, M. Yamauchi, R. Slapak
Publikováno v:
Annales Geophysicae, Vol 38, Pp 645-656 (2020)
Ion escape is of particular interest for studying the evolution of the atmosphere on geological timescales. Previously, using Cluster-CODIF data, we investigated the oxygen ion outflow from the plasma mantle for different solar wind conditions and ge
Externí odkaz:
https://doaj.org/article/d493b6c9ad724bf7a5c3f3f64cfa861f
Publikováno v:
Annales Geophysicae, Vol 33, Pp 1331-1342 (2015)
The plasma on a magnetic field line in the downward current region of the aurora is simulated using a Vlasov model. It is found that an electric field parallel to the magnetic fields is supported by a double layer moving toward higher altitude.
Externí odkaz:
https://doaj.org/article/cedf680aa52247e19eb80cc68c619bfe
Publikováno v:
Annales Geophysicae, Vol 33, Pp 279-293 (2015)
The plasma on an auroral field line is simulated using a Vlasov model. In the initial state, the acceleration region extends from one to three Earth radii in altitude with about half of the acceleration voltage concentrated in a stationary double
Externí odkaz:
https://doaj.org/article/7e92847388bd4737a84fa45bc21b0fd9
Autor:
H. Gunell, G. Stenberg Wieser, M. Mella, R. Maggiolo, H. Nilsson, F. Darrouzet, M. Hamrin, T. Karlsson, N. Brenning, J. De Keyser, M. André, I. Dandouras
Publikováno v:
Annales Geophysicae, Vol 32, Pp 991-1009 (2014)
Plasmoids, defined here as plasma entities with a higher anti-sunward velocity component than the surrounding plasma, have been observed in the magnetosheath in recent years. During the month of March 2007 the Cluster spacecraft crossed the magne
Externí odkaz:
https://doaj.org/article/142402e414c74e4ca4f5d8ec465f131d
Publikováno v:
Annales Geophysicae, Vol 31, Pp 1227-1240 (2013)
An auroral flux tube is modelled from the magnetospheric equator to the ionosphere using Vlasov simulations. Starting from an initial state, the evolution of the plasma on the flux tube is followed in time. It is found that when applying a voltag
Externí odkaz:
https://doaj.org/article/28224821c8814888a57f72630aba0812
Publikováno v:
Annales Geophysicae, Vol 28, Pp 907-916 (2010)
We present a case study of significant heating (up to 8 keV) perpendicular to the geomagnetic field of outflowing oxygen ions at high altitude (12 RE) above the polar cap. The shape of the distribution functions indicates that most of the heating
Externí odkaz:
https://doaj.org/article/ae9a594038ef4587a9114b6471034cd4
Autor:
S. McKenna-Lawlor, L. Li, S. Barabash, K. Kudela, J. Balaz, I. Strharsky, K. Brinkfeldt, H. Gunell, C. Shen, J. Shi, J.-B. Cao, Q. Zong, S.-Y. Fu, E. C. Roelof, P. C. Brandt, I. Dandouras
Publikováno v:
Annales Geophysicae, Vol 23, Pp 2825-2849 (2005)
The Earth’s ring current and how it responds to varying interplanetary conditions is described and an account provided of the production of Energetic Neutral Atoms (ENAs) in the geo-corona. Also, the potential to remotely monitor, on a global s
Externí odkaz:
https://doaj.org/article/37ba8200a08a4bceb68a2a65cf58acd3
Autor:
L. Lu, S. McKenna-Lawlor, S. Barabash, Z. X. Liu, J. Balaz, K. Brinkfeldt, I. Strharsky, C. Shen, J. K. Shi, J. B. Cao, S. Y. Fu, H. Gunell, K. Kudela, E. C. Roelof, P. C. Brandt, I. Dandouras, T. L. Zhang, C. Carr, A. Fazakerley
Publikováno v:
Annales Geophysicae, Vol 23, Pp 2953-2959 (2005)
The NUADU (NeUtral Atom Detector Unit) experiment aboard TC-2 recorded, with high temporal and spatial resolution, 4π solid angle images of electrons (~50-125 keV) spiraling around geomagnetic field lines at high northern magnetic latitudes (L>10
Externí odkaz:
https://doaj.org/article/727b3e9e73d946a19242c4f53fbcfba1