Results 11 to 20 of about 23,252 (283)

Edge of polar cap patches [PDF]

Journal of Geophysical Research: Space Physics, 2016
AbstractOn the night of 4 December 2013, a sequence of polar cap patches was captured by an all‐sky airglow imager (ASI) in Longyearbyen, Norway (78.1°N, 15.5°E). The 630.0 nm airglow images from the ASI of 4 second exposure time, oversampled the emission of natural lifetime (with quenching) of at least ∼30 sec, introduce no observational blurring ...
K. Hosokawa, S. Taguchi, Y. Ogawa
openaire   +3 more sources

The Ion/Electron Temperature Characteristics of Polar Cap Classical and Hot Patches and Their Influence on Ion Upflow

Geophysical Research Letters, 2018
The term of “polar cap hot patch” is a newly identified high‐density plasma irregularity at high latitudes, which is associated with high electron temperature and particle precipitation, while a classical polar cap patch has lower electron temperature ...
Yu‐Zhang Ma, Qing‐He Zhang, Zan‐Yang Xing, Roderick A. Heelis, Kjellmar Oksavik, Yong Wang   +5 more
doaj   +2 more sources

The interconnection between cross‒polar cap convection and the luminosity of polar cap patches [PDF]

Journal of Geophysical Research: Space Physics, 2013
The transport of patches of ionization across the polar cap is carried by the convection electric field, which imposes an E×B drift to the plasma. This drift has an upward component when the plasma is convected toward the north magnetic pole and a downward component as it moves away from the pole.
G. W. Perry, J.‒P. St.‒Maurice, K. Hosokawa   +2 more
openaire   +3 more sources

Global imaging of polar cap patches with dual airglow imagers [PDF]

Geophysical Research Letters, 2014
During a 2 h interval from 2240 to 2440 UT on 12 November 2012, regions of increased 630.0 nm airglow emissions were simultaneously detected by dual all‐sky imagers in the polar cap, one at Longyearbyen, Norway (78.1°N, 15.5°E) and the other at Resolute Bay, Canada (74.7°N, 265.1°E). The Resolute Bay incoherent scatter radar observed clear enhancements
K. Hosokawa, S. Taguchi, K. Shiokawa, Y. Otsuka, Y. Ogawa, M. Nicolls   +5 more
openaire   +3 more sources

Earth's ion upflow associated with polar cap patches: global and in-situ observations [PDF]

Geophysical Research Letters, 2016
We report simultaneous global monitoring of a patch of ionization and in situ observation of ion upflow at the center of the polar cap region during a geomagnetic storm.
Dunlop, Malcolm W., Hairston, Marc, Heelis, Roderick A., Lester, Mark, Liang, Jun, Liu, Rui-Yuan, Liu, Yong C.-M., Lockwood, Michael, Ma, Yu-Zhang, McCrea, Ian, Moen, Jøran, Ruohoniemi, J. Michael, Thomas, Evan G., Zhang, Bei-Chen, Zhang, Qing-He, Zhang, Shun-Rong, Zhang, Yong-Liang, Zong, Qiu-Gang   +17 more
core   +3 more sources

Tracking of polar cap ionospheric patches using data assimilation [PDF]

Journal of Geophysical Research: Space Physics, 2007
Ionospheric F‐region patches are 2–10 larger than background electron densities in the polar ionosphere. The EISCAT Svalbard incoherent radar (ESR) observed a sequence of patches between 2000–2200 UT on 12 December 2001. In this paper the source of these structures is investigated using several other data sets, together with a convection‐driven ...
G. S. Bust, G. Crowley
openaire   +3 more sources

Determining decay rates of polar cap plasma using bservations of polar cap patches [PDF]

, 2015
Polar cap patches are large scale structures occurring in the high-latitude ionosphere. They are regions of enhanced plasma density of at least twice the background density, and they are often observed in the polar cap region. The primary decay mechanism
Hardwick, L, Wood, A
core   +2 more sources

GPS phase scintillation at high latitudes during geomagnetic storms of 7–17 March 2012 – Part 2: Interhemispheric comparison [PDF]

Annales Geophysicae, 2015
During the ascending phase of solar cycle 24, a series of interplanetary coronal mass ejections (ICMEs) in the period 7–17 March 2012 caused geomagnetic storms that strongly affected high-latitude ionosphere in the Northern and Southern Hemisphere ...
P. Prikryl, P. Prikryl, R. Ghoddousi-Fard, L. Spogli, C. N. Mitchell, G. Li, B. Ning, P. J. Cilliers, V. Sreeja, M. Aquino, M. Terkildsen, P. T. Jayachandran, Y. Jiao, Y. T. Morton, J. M. Ruohoniemi, E. G. Thomas, Y. Zhang, A. T. Weatherwax, L. Alfonsi, G. De Franceschi, V. Romano   +20 more
doaj   +6 more sources

On the possible role of cusp/cleft precipitation in the formation of polar-cap patches [PDF]

Annales Geophysicae, 1999
The work describes experimental observations of enhancements in the electron density of the ionospheric F-region created by cusp/cleft particle precipitation at the dayside entry to the polar-cap convection flow.
I. K. Walker, I. K. Walker, J. Moen, J. Moen, L. Kersley, D. A. Lorentzen   +5 more
doaj   +3 more sources

GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm [PDF]

Annales Geophysicae, 2013
The amplitude and phase scintillation indices are customarily obtained by specialised GPS Ionospheric Scintillation and TEC Monitors (GISTMs) from L1 signal recorded at the rate of 50 Hz.
P. Prikryl, R. Ghoddousi-Fard, B. S. R. Kunduri, E. G. Thomas, A. J. Coster, P. T. Jayachandran, E. Spanswick, D. W. Danskin   +7 more
doaj   +5 more sources