Results 11 to 20 of about 858,402 (225)
Coordinated Cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe [PDF]
Annales Geophysicae, 2001 During the interval between 8:00–9:30 on 14 January 2001, the four Cluster spacecraft were moving from the central magnetospheric lobe, through the dusk sector mantle, on their way towards intersecting the magnetopause near 15:00 MLT and 15:00 UT.
M. Lockwood +40 more
doaj +6 more sources
Journal of Space Weather and Space Climate, 2014 We directly compare the relative GPS scintillation levels associated with regions of enhanced plasma irregularities called auroral arcs, polar cap patches, and auroral blobs that frequently occur in the polar ionosphere.
Jin Yaqi +2 more
doaj +2 more sources
Diurnal and seasonal occurrence of polar patches [PDF]
Annales Geophysicae, 1996 Analysis of the diurnal and seasonal variation of polar patches, as identified in two years of HF-radar data from Halley, Antarctica during a period near sunspot maximum, shows that there is a broad maximum in occurrence centred about magnetic noon ...
A. S. Rodger, A. C. Graham
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Polar cap patches observed during the magnetic storm of November 2003: observations and modeling [PDF]
Annales Geophysicae, 2015 We present multi-instrumented measurements and multi-technique analysis of polar cap patches observed early during the recovery phase of the major magnetic storm of 20 November 2003 to investigate the origin of the polar cap patches. During this event,
C. E. Valladares +2 more
doaj +2 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 is via a two-step rearrangement and recombination reaction involving Oxygen and Nitrogen.
Hardwick, L, Wood, A
core +5 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 +5 more
doaj +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
Keisuke Hosokawa +2 more
exaly +2 more sources
Seasonal influence on polar cap patches in the high‐latitude nightside ionosphere [PDF]
Journal of Geophysical Research: Space Physics, 2010 The influence of the season on the patch‐to‐background density ratio of polar cap patches in the nightside ionosphere was observed above northern Scandinavia around solar maximum (1999–2001). This is the first study of the seasonal effect in the nightside polar ionosphere.
Wood, AG, Pryse, SE
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Modelling the propagation of polar cap patches
, 2021 Space weather explores dynamics between the Sun- interplanetary medium and the Earth’s magnetosphere and upper atmosphere. Space weather is known for causing disturbances in Global Navigation Satellite Systems (GNSS) and these disturbances are rapid changes in the amplitude and phase of a signal that a receiver receives, known as scintillations.
Bråthen, Sean William
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Statistical Characteristics of Polar Cap Patches Observed by RISR‐C [PDF]
Journal of Geophysical Research: Space Physics, 2018 AbstractPolar cap “patches” are ~100 to 1,000 km islands of high‐density plasma at polar latitudes, which can cause scintillation to communication and navigation signals. An automatic algorithm for patch identification has been developed and applied to the observations from the Resolute Bay Incoherent Scatter Radar‐Canada during January to March and ...
Jiaen Ren +4 more
openaire +4 more sources