Results 21 to 30 of about 858,402 (225)
Decay of Polar Cap Patch [PDF]
Journal of Geophysical Research: Space Physics, 2011 Keisuke Hosokawa +2 more
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Earth's Ion Upflow Associated With Polar Cap Patches: Global and in Situ Observations [PDF]
Geophysical Research Letters, 2016 AbstractWe 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. Our observations indicate strong fluxes of upwelling O+ ions originating from frictional heating produced by rapid antisunward flow of the plasma patch. The statistical results
Yu-Zhang Ma, Mark Lester, Evan G Thomas
exaly +3 more sources
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
openaire +2 more sources
Polar Cap Patch Prediction in the Expanding Contracting Polar Cap Paradigm [PDF]
Space Weather, 2019 AbstractSpace weather can cause serious disturbances of global navigation satellite systems (GNSS) used for positioning and navigation purposes. This paper describes a new method to forecast space weather disturbances on GNSS at high latitudes, in which we describe the formation and propagation of polar cap patches and predict their arrival at the ...
A. Fæhn Follestad +4 more
openaire +2 more sources
HF radar polar patch formation revisited: summer and winter variations in dayside plasma structuring [PDF]
Annales Geophysicae, 2002 Three intervals of polar patch formation, as observed by the CUTLASS Finland HF coherent radar, are presented. Simultaneous observations from a vertical ionosonde located at Longyearbyen on Svalbard, situated in the dayside convection throat region,
S. E. Milan +3 more
doaj +1 more source
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
openaire +1 more source
Multi-instrument observations of polar cap patches and traveling ionospheric disturbances generated by solar wind Alfvén waves coupling to the dayside magnetosphere [PDF]
Annales Geophysicae, 2022 During minor to moderate geomagnetic storms, caused by corotating interaction regions (CIRs) at the leading edge of high-speed streams (HSSs), solar wind Alfvén waves modulated the magnetic reconnection at the dayside magnetopause.
P. Prikryl +6 more
doaj +1 more source
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
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, H. C. +4 more
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Global Positioning System (GPS) Scintillation Associated with a Polar Cap Patch [PDF]
Remote Sensing, 2021 A Global Positioning System (GPS) network in the polar cap, along with ionosonde and SuperDARN radar measurements, are used to study GPS signal amplitude and phase scintillation associated with a polar cap patch. The patch was formed due to a north-to-south transition of the interplanetary magnetic field (IMF Bz).
Jayachandran P. Thayyil +7 more
openaire +2 more sources