Results 21 to 30 of about 24,293 (260)
Localized polar cap flow enhancement tracing using airglow patches: Statistical properties, IMF dependence, and contribution to polar cap convection [PDF]
Journal of Geophysical Research: Space Physics, 2015 AbstractRecent radar observations have suggested that polar cap flows are highly structured and that localized flow enhancements can lead to nightside auroral disturbances. However, knowledge of these flows is limited to available echo regions. Utilizing wide spatial coverage by an all‐sky imager at Resolute Bay and simultaneous Super Dual Auroral ...
Ying Zou +7 more
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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 ...
Clausen, Lasse B. N. +5 more
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Decay of polar cap patch [PDF]
Journal of Geophysical Research: Space Physics, 2011 K. Hosokawa +3 more
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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
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Periodicities of polar cap patches [PDF]
Journal of Geophysical Research: Space Physics, 2013 A highly sensitive all‐sky electron multiplier charge‐coupled device airglow imager has been operative in Longyearbyen, Norway since October 2011. The imager captures 630.0 nm all‐sky images with an exposure time of 4 s, which is about 10 times shorter than that achieved by conventional cooled CCD imagers.
K. Hosokawa +3 more
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Morphology of polar cap patch activity [PDF]
Radio Science, 1999 For the period July 1, 1989, to June 30, 1990, for high solar activity, ƒ0F2 data were recorded by the Digital Ionospheric Sounding Systems from two Qaanaaq and Sondrestromfjord; ionospheric UHF scintillation data were recorded from Thule; and airglow images were recorded from Qaanaaq.
B. S. Dandekar, T. W. Bullett
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Geophysical Research Letters, 2022 By using a database of 4,634 cold patches (high density and low electron temperature) and 4,700 hot patches (high density and high electron temperature) from Defense Meteorological Satellite Program F16 in 2005–2018 winter months (October–March), we ...
Duan Zhang +8 more
doaj +1 more source
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
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The thermospheric effects of a rapid polar cap expansion [PDF]
Annales Geophysicae, 1998 In a previous publication we used results from a coupled thermosphere-ionosphere-plasmasphere model to illustrate a new mechanism for the formation of a large-scale patch of ionisation arising from a rapid polar cap expansion.
D. W. Idenden
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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 +2 more
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