Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Thom R. Edwards"'
Autor:
Thom R. Edwards, Michael Hartinger, Valery A. Martines-Bedenko, Vyacheslav Pilipenko, Evgeny N. Fedorov, Mark J. Engebretson, S. Coyle
Publikováno v:
Pilipenko, V A, Martines–Bedenko, V A, Coyle, S, Fedorov, E N, Hartinger, M D, Engebretson, M J & Edwards, T R 2021, ' Conjugate properties of magnetospheric Pc5 waves: Antarctica-Greenland comparison ', Journal of Geophysical Research: Space Physics, vol. 126, no. 2, e2020JA028048 . https://doi.org/10.1029/2020JA028048
An electric circuit analogy for magnetosphere – ionosphere current systems has two extremes for their driver: a current generator and voltage generator. In the case of a magnetospheric current generator the ground magnetic effect must be nearly the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66359ba469376bd4f2af97f5eef588ef
https://orbit.dtu.dk/en/publications/df62c17e-e67f-45e0-9a73-05064fa849ca
https://orbit.dtu.dk/en/publications/df62c17e-e67f-45e0-9a73-05064fa849ca
Autor:
Thom R. Edwards, Daniel R. Weimer
Publikováno v:
Annales Geophysicae, Vol 39, Pp 31-51 (2021)
Weimer, D & Edwards, T 2021, ' Testing the electrodynamic method to derive height-integrated ionospheric conductances ', Annales Geophysicae, vol. 39, no. 1, pp. 31-51 . https://doi.org/10.5194/angeo-39-31-2021
Weimer, D & Edwards, T 2021, ' Testing the electrodynamic method to derive height-integrated ionospheric conductances ', Annales Geophysicae, vol. 39, no. 1, pp. 31-51 . https://doi.org/10.5194/angeo-39-31-2021
We have used empirical models for electric potentials and the magnetic fields both in space and on the ground to obtain maps of the height-integrated Pedersen and Hall ionospheric conductivities at high latitudes. This calculation required use of bot
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::41f9fe99eab7595cca93b4a869800834
https://doi.org/10.5194/angeo-2020-60
https://doi.org/10.5194/angeo-2020-60
Autor:
Kathryn R. Kirkevold, M. C. Rose, David Boteler, Thom R. Edwards, Audrey Schillings, Hermann Opgenoorth, Michael Hartinger, Anna Willer, Mark B. Moldwin, Brett A. McCuen, Mervyn P. Freeman, E. S. Steinmetz, Andrew J. Gerrard, C. R. Clauer, Viacheslav Pilipenko, S. Coyle, Mark J. Engebretson
Publikováno v:
Engebretson, M J, Kirkevold, K R, Steinmetz, E S, Pilipenko, V A, Moldwin, M B, McCuen, B A, Clauer, C R, Hartinger, M D, Coyle, S, Opgenoorth, H, Opgenoorth, H, Willer, A N, Edwards, T R, Boteler, D H, Gerrard, A J, Freeman, M P & Rose, M C 2020, ' Interhemispheric Comparisons of Large Nighttime Magnetic Perturbation Events Relevant to GICs ', Journal of Geophysical Research: Space Physics, vol. 125, no. 8, e2020JA028128 . https://doi.org/10.1029/2020JA028128
Nearly all studies of impulsive magnetic perturbation events (MPEs) with large magnetic field variability (dB/dt) that can produce dangerous geomagnetically‐induced currents (GICs) have used data from the northern hemisphere. Here we present detail
Autor:
C. R. Clauer, Denny M. Oliveira, Michael Hartinger, S. Coyle, Zhonghua Xu, Thom R. Edwards, Daniel R. Weimer
Publikováno v:
Xu, Z, Hartinger, M D, Oliveira, D M, Coyle, S, Clauer, C R, Weimer, D & Edwards, T R 2020, ' Interhemispheric Asymmetries in the Ground Magnetic Response to Interplanetary Shocks: The Role of Shock Impact Angle ', Space Weather, vol. 18, no. 3 . https://doi.org/10.1029/2019sw002427
Interplanetary (IP) shocks drive magnetosphere-ionosphere (MI) current systems that in turn are associated with ground magnetic perturbations. Recent work has shown that IP shock impact angle plays a significant role in controlling the subsequent geo
Autor:
Zhonghua Xu, Michael Hartinger, Thom R. Edwards, Mark J. Engebretson, Vyacheslav Pilipenko, E. N. Fedorov
Publikováno v:
Pilipenko, V A, Fedorov, E N, Xu, Z, Hartinger, M D, Engebretson, M J & Edwards, T R 2020, ' Incidence of Alfvenic SC pulse onto the conjugate ionospheres ', Journal of Geophysical Research: Space Physics, vol. 125, no. 2, e2019JA027397 . https://doi.org/10.1029/2019ja027397
A circuit analogy for magnetosphere - ionosphere current systems has two extremes: the voltage generator (when the ground magnetic response is proportional to the ionospheric conductance) and the current generator (when the ground magnetic response p
Autor:
Daniel R. Weimer, Hermann Lühr, Nils Olsen, Brian J. Anderson, W. K. Tobiska, Thom R. Edwards
Publikováno v:
Journal of Geophysical Research: Space Physics
Edwards, T, Weimer, D R, Olsen, N, Lühr, H, Tobiska, W K & Anderson, B J 2020, ' A Third Generation Field-Aligned Current Model ', Journal of Geophysical Research, vol. 125, no. 1, e2019JA027249 . https://doi.org/10.1029/2019JA027249
Edwards, T, Weimer, D R, Olsen, N, Lühr, H, Tobiska, W K & Anderson, B J 2020, ' A Third Generation Field-Aligned Current Model ', Journal of Geophysical Research, vol. 125, no. 1, e2019JA027249 . https://doi.org/10.1029/2019JA027249
A new empirical model of field‐aligned currents in the Earth's ionosphere has been developed. This model is derived using magnetometer data from the CHAallenging Minisatellite Payload, Ø rsted, and Swarm satellite missions, which has created a dat
Publikováno v:
Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018).
GNSS-based spacecraft formation flying in LEO presents new opportunities for ionospheric remote sensing. This work demonstrates the successful application of ionospheric tomography using the newly developed Virginia Tech Formation Flying Testbed (VTF
Publikováno v:
R. Edwards, T, Weimer, D R, Tobiska, W K & Olsen, N 2017, ' Field-Aligned Current Response to Solar Indices ', Journal of Geophysical Research, vol. 122, no. 5, pp. 5798-5815 . https://doi.org/10.1002/2016ja023563
Magnetometer data from three satellite missions have been used to analyze and identify the effects of varying solar radiation on the magnitudes and locations of field-aligned currents in the Earth's upper atmosphere. Data from the CHAMP, Ørsted, and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::51f086d2f78074955f46613828748798
https://orbit.dtu.dk/en/publications/8c9f23cc-0cb8-465b-8ff6-9a95b446c70f
https://orbit.dtu.dk/en/publications/8c9f23cc-0cb8-465b-8ff6-9a95b446c70f
Publikováno v:
Weimer, D R, R. Edwards, T & Olsen, N 2017, ' Linear Response of Field-Aligned Currents to the Interplanetary Electric Field ', Journal of Geophysical Research: Atmospheres, vol. 122, no. 8, pp. 8502–8515 . https://doi.org/10.1002/2017JA024372
Many studies that have shown that the ionospheric, polar cap electric potentials (PCEP) exhibit a “saturation” behavior in response to the level of the driving by the solar wind. As the magnitude of the interplanetary magnetic field (IMF) and ele
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2473f8708c2d64281478100285024bab
https://orbit.dtu.dk/en/publications/0e23150d-f9eb-4732-a1f0-d5caac6f9a78
https://orbit.dtu.dk/en/publications/0e23150d-f9eb-4732-a1f0-d5caac6f9a78