Results 1 to 10 of about 23,252 (283)

GPS scintillations associated with cusp dynamics and polar cap patches [PDF]

Journal of Space Weather and Space Climate, 2017
This paper investigates the relative scintillation level associated with cusp dynamics (including precipitation, flow shears, etc.) with and without the formation of polar cap patches around the cusp inflow region by the EISCAT Svalbard radar (ESR) and ...
Jin Yaqi, Moen Jøran I., Oksavik Kjellmar, Spicher Andres, Clausen Lasse B.N., Miloch Wojciech J.   +5 more
doaj   +8 more sources

Polar cap hot patches: enhanced density structures different from the classical patches in the ionosphere [PDF]

Geophysical Research Letters, 2017
Based on in situ and ground-based observations, a new type of “polar cap hot patch” has been identified that is different from the classical polar cap enhanced density structure (cold patches).
B.-C. Zhang, Basu, Carlson, Carlson, Carter, Crowley, Crowley, D. R. Themens, Foster, J. C. Foster, J. Moen, Jayachandran, Jin, Jin, Jin, Knudsen, Lockwood, Lockwood, Lockwood, Lockwood, M. Lockwood, MacDougall, Maggiolo, Moen, Nishimura, Oksavik, P. T. Jayachandran, Q.-H. Zhang, Redmon, S.-R. Zhang, Themens, Themens, Thomas, Wang, Weber, Y. Wang, Y.-L. Zhang, Y.-Z. Ma, Z. Y. Xing, Zhang, Zhang, Zhang, Zhang, Zhang, Zhang, Zhang, Zhang, Q.-H., Zou   +47 more
core   +7 more sources

Space weather challenges of the polar cap ionosphere [PDF]

Journal of Space Weather and Space Climate, 2013
This paper presents research on polar cap ionosphere space weather phenomena conducted during the European Cooperation in Science and Technology (COST) action ES0803 from 2008 to 2012.
Spogli Luca, Romano Vineenzo, Daabakk Yvonne, Alfonsi Lucilla, Oksavik Kjellmar, Moen Jøran   +5 more
doaj   +5 more sources

Do the Throat Auroras Create Polar Cap Patches?

Geophysical Research Letters, 2023
Throat auroras and polar cap patches are common phenomena in the polar ionosphere resulting from magnetosphere‐ionosphere coupling. A campaign was organized, with all‐sky imagers at Yellow River Station, the European Incoherent Scatter Svalbard Radar ...
Duan Zhang, Qing‐He Zhang, Kjellmar Oksavik, Tong Xu, Zan‐Yang Xing, L. R. Lyons, De‐Sheng Han, Hong‐Bo Zhang, Yu‐Zhang Ma, Ze‐Jun Hu, Jian‐Jun Liu, Yong Wang, Xiang‐Yu Wang   +12 more
doaj   +4 more sources

On a new process for cusp irregularity production [PDF]

Annales Geophysicae, 2008
Two plasma instability mechanisms were thought until 2007 to dominate the formation of plasma irregularities in the F region high latitude and polar ionosphere; the gradient-drift driven instability, and the velocity-shear driven instability.
H. C. Carlson, H. C. Carlson, K. Oksavik, J. Moen   +3 more
doaj   +5 more sources

Recently research advances on the polar cap patches

地球与行星物理论评, 2023
The polar cap patch is a common ionospheric structure. It often appears in the F region of the ionosphere over the polar caps; these patches are usually characterized by electron densities that can be even twice greater than that of the surrounding area.
Yong Wang, Qinghe Zhang, Zanyang Xing, Yuzhang Ma, Duan Zhang   +4 more
doaj   +2 more sources

A comparison between large‐scale irregularities and scintillations in the polar ionosphere [PDF]

Geophysical Research Letters, 2016
A comparison tool has been developed by mapping the global GPS total electron content (TEC) and large coverage of ionospheric scintillations together on the geomagnetic latitude/magnetic local time coordinates. Using this tool, a comparison between large‐
Y. Wang, Q.‐H. Zhang, P. T. Jayachandran, M. Lockwood, S.‐R. Zhang, J. Moen, Z.‐Y. Xing, Y.‐Z. Ma, M. Lester   +8 more
doaj   +2 more sources

Motion of the dayside polar cap boundary during substorm cycles: II. Generation of poleward-moving events and polar cap patches by pulses in the magnetopause reconnection rate [PDF]

Annales Geophysicae, 2005
Using data from the EISCAT (European Incoherent Scatter) VHF and CUTLASS (Co-operative UK Twin-Located Auroral Sounding System) HF radars, we study the formation of ionospheric polar cap patches and their relationship to the magnetopause reconnection ...
M. Lockwood, M. Lockwood, J. A. Davies, J. Moen, J. Moen, A. P. van Eyken, K. Oksavik, K. Oksavik, I. W. McCrea, M. Lester   +9 more
doaj   +4 more sources

Polar Cap Patches Scaling Properties: Insights from Swarm Data

Remote Sensing, 2023
Among the effects of space weather, the degradation of air traffic communications and satellite-based navigation systems are the most notable.
Roberta Tozzi, Paola De Michelis, Giulia Lovati, Giuseppe Consolini, Alessio Pignalberi, Michael Pezzopane, Igino Coco, Fabio Giannattasio, Maria Federica Marcucci   +8 more
doaj   +2 more sources

Association of radio polar cap brightening with bright patches and coronal holes [PDF]

The Astrophysical Journal, 2017
Radio-bright regions near the solar poles are frequently observed in Nobeyama Radioheliograph (NoRH) maps at 17 GHz, and often in association with coronal holes. However, the origin of these polar brightening has not been established yet. We propose that
Costa, Joaquim E. R., de Castro, C. G. Gimenez, Selhorst, Caius L., Silva, Alexandre J. Oliveira e, Simoes, Paulo J. A., Valio, Adriana   +5 more
core   +4 more sources