Results 31 to 40 of about 24,293 (260)
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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Observations and modeling of scintillation in the vicinity of a polar cap patch
Journal of Space Weather and Space Climate, 2022 Small-scale ionospheric plasma structures can cause scintillation in radio signals passing through the ionosphere. The relationship between the scintillated signal and how plasma structuring develops is complex.
Lamarche Leslie J. +2 more
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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. For this reason, it is of uttermost importance to understand the nature and origin of ionospheric irregularities that are at the base of the observed communication outages.
Roberta Tozzi +8 more
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Polar cap patches, GPS TEC variations, and atmospheric gravity waves [PDF]
, 2021 <p>The southward pointing field of view of the Canadian component of the Resolute Bay Incoherent Scatter Radar (RISR-C) is well suited for observing the ionospheric signatures of flux transfer events and subsequent polar patch formation in the cusp.
Paul Prikryl +5 more
openaire +3 more sources
ESR mapping of polar‐cap patches in the dark cusp [PDF]
Geophysical Research Letters, 2002 We present the first ever measurement of the full thermal plasma properties, of an ionospheric patch in full darkness in the noon region where patches are believed to form. Further these data present the first experimental evidence for the Lockwood and Carlson class of mechanisms for forming patches by plasma injection.
Carlson, HC +4 more
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Automated identification and tracking of polar-cap plasma patches at solar minimum [PDF]
Annales Geophysicae, 2014 A method of automatically identifying and tracking polar-cap plasma patches, utilising data inversion and feature-tracking methods, is presented.
R. Burston +3 more
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Modulation of nightside polar patches by substorm activity [PDF]
Annales Geophysicae, 2009 Results are presented from a multi-instrument study showing the influence of geomagnetic substorm activity on the spatial distribution of the high-latitude ionospheric plasma.
A. G. Wood, S. E. Pryse, J. Moen
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Relationship of theoretical patch climatology to polar cap patch observations
Radio Science, 1996 During a southward orientation of the interplanetary magnetic field (IMF), patches are often observed moving antisunward across the polar cap. In saying “patches” we refer to structures in which the F region electron densities are enhanced relative to lower background levels; we do not in this paper consider patches which are observed optically (see J.
Bowline, M. D. +2 more
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Reconfiguration of polar-cap plasma in the magnetic midnight sector [PDF]
Annales Geophysicae, 2006 Radio tomography and the EISCAT and SuperDARN radars have been used to identify long-lived, high-altitude, cold plasma in the antisunward convective flow across the polar cap.
S. E. Pryse +4 more
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Polar cap plasma patch primary linear instability growth rates compared [PDF]
Journal of Geophysical Research: Space Physics, 2016 AbstractFour primary plasma instability processes have been proposed in the literature to explain the generation of phase scintillation associated with polar cap plasma patches. These are the gradient drift, current convective, and Kelvin‐Helmholtz instabilities and a small‐scale “turbulence” process.
Burston, Robert +2 more
openaire +1 more source