Zobrazeno 1 - 10
of 20
pro vyhledávání: '"D. J. Knudsen"'
Autor:
S. M. Hatch, H. Vanhamäki, K. M. Laundal, J. P. Reistad, J. K. Burchill, L. Lomidze, D. J. Knudsen, M. Madelaire, H. Tesfaw
Publikováno v:
Annales Geophysicae, Vol 42, Pp 229-253 (2024)
Ionospheric electrodynamics is a problem of mechanical stress balance mediated by electromagnetic forces. Joule heating (the total rate of frictional heating of thermospheric gases and ionospheric plasma) and ionospheric Hall and Pedersen conductance
Externí odkaz:
https://doaj.org/article/a54c5776926f471ea2266e24b8c5f2b1
Autor:
B. Gallardo‐Lacourt, Y. Nishimura, L. Kepko, E. L. Spanswick, D. M. Gillies, D. J. Knudsen, J. K. Burchill, S. H. Skone, V. A. Pinto, D. Chaddock, J. Kuzub, E. F. Donovan
Publikováno v:
Geophysical Research Letters, Vol 51, Iss 19, Pp n/a-n/a (2024)
Abstract Strong Thermal Emission Velocity Enhancement (STEVE), is a captivating optical phenomenon typically observed in the mid‐latitude ionosphere. This paper presents an intriguing observation of a STEVE event at high‐latitudes, approximately
Externí odkaz:
https://doaj.org/article/169c23a47feb4c369f483ba18d170b5e
Publikováno v:
Earth, Planets and Space, Vol 74, Iss 1, Pp 1-18 (2022)
Abstract Electric and magnetic field data from the Swarm constellation mission are used to report on the Poynting flux associated with postsunset topside equatorial spread F. A three-dimensional numerical simulation of plasma density irregularities i
Externí odkaz:
https://doaj.org/article/fe6aa50c8d2a47828b4a14c90dbc6e2b
Publikováno v:
Geophysical Research Letters, Vol 50, Iss 10, Pp n/a-n/a (2023)
Abstract Three events are presented where high‐resolution measurements from the Swarm satellites coincided with excellent F‐region ionospheric coverage from The Super Dual Auroral Radar Network (SuperDARN). Large‐scale ionospheric convection pa
Externí odkaz:
https://doaj.org/article/14a709e939ba43dc9fa3c023ba97891f
Autor:
M. Palmroth, M. Grandin, T. Sarris, E. Doornbos, S. Tourgaidis, A. Aikio, S. Buchert, M. A. Clilverd, I. Dandouras, R. Heelis, A. Hoffmann, N. Ivchenko, G. Kervalishvili, D. J. Knudsen, A. Kotova, H.-L. Liu, D. M. Malaspina, G. March, A. Marchaudon, O. Marghitu, T. Matsuo, W. J. Miloch, T. Moretto-Jørgensen, D. Mpaloukidis, N. Olsen, K. Papadakis, R. Pfaff, P. Pirnaris, C. Siemes, C. Stolle, J. Suni, J. van den IJssel, P. T. Verronen, P. Visser, M. Yamauchi
Publikováno v:
Annales Geophysicae, Vol 39, Pp 189-237 (2021)
The lower-thermosphere–ionosphere (LTI) system consists of the upper atmosphere and the lower part of the ionosphere and as such comprises a complex system coupled to both the atmosphere below and space above. The atmospheric part of the LTI is dom
Externí odkaz:
https://doaj.org/article/cfe2c3bae6e04b5097c10b6750012a54
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-9 (2021)
Seasonally averaged energy input into the ionosphere from geospace is generally considered to be symmetric. Here, the authors show preference for electromagnetic energy input at 450 km altitude into the northern hemisphere, on both the dayside and th
Externí odkaz:
https://doaj.org/article/e4bf6cfa81644e46b5465784b5503cfe
Publikováno v:
Earth and Space Science, Vol 8, Iss 11, Pp n/a-n/a (2021)
Abstract Ion temperature is one of the key parameters that provides insight into the thermal balance of the coupled ionosphere‐thermosphere system. Together with the temperatures of neutral and electron gases, it affects physical and chemical proce
Externí odkaz:
https://doaj.org/article/98c1e88615ed49768fc57789c816c5c5
A two-fluid model describing the finite-collisionality, stationary Alfvén wave in anisotropic plasma
Publikováno v:
Nonlinear Processes in Geophysics, Vol 15, Iss 6, Pp 957-964 (2008)
The stationary inertial Alfvén (StIA) wave (Knudsen, 1996) was predicted for cold, collisionless plasma. The model was generalized (Finnegan et al., 2008) to include nonzero values of electron and ion collisional resistivity and thermal pressure. He
Externí odkaz:
https://doaj.org/article/736cf99f613a4679aae7d8cf7e6b1016
Publikováno v:
Journal of Geophysical Research: Space Physics. 128
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9d3bf8451b06d8edb11a0c7d4a32bc06
https://doi.org/10.1029/2022ja031123
https://doi.org/10.1029/2022ja031123
Publikováno v:
Journal of Geophysical Research: Space Physics. 127
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1352e88cb7e39fd9c2f1bb54497699f5
https://doi.org/10.1029/2022ja030573
https://doi.org/10.1029/2022ja030573