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
openaire +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
doaj +1 more source
On the diurnal variability in F2-region plasma density above the EISCAT Svalbard radar [PDF]
Annales Geophysicae, 2008 Two long runs of EISCAT Svalbard Radar (ESR), in February 2001 and October 2002, have been analysed with respect to variability in the F2 region peak density and altitude.
J. Moen +5 more
doaj +1 more source
On the possible role of cusp/cleft precipitation in the formation of polar-cap patches [PDF]
Annales Geophysicae, 1999 The work describes experimental observations of enhancements in the electron density of the ionospheric F-region created by cusp/cleft particle precipitation at the dayside entry to the polar-cap convection flow.
I. K. Walker +5 more
doaj +1 more source
Ionospheric patch formation: Direct measurements of the origin of a polar cap patch [PDF]
Geophysical Research Letters, 2004 We present the first direct measurements documenting the origin of an ionospheric patch, emerging into the polar cap from the noon dark cusp region of the dayside auroral oval. A series of such patches were observed. The observed patch‐formation signatures, in plasma density and velocity, ion and electron temperature, and optical ...
Herbert C. Carlson +3 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
doaj +1 more source
On the entry and transit of high-density plasma across the polar cap [PDF]
, 2010 [1] Observations are presented from SuperDARN and the EISCAT Svalbard Radar of two intense polar cap patch events on 6 February 2001. The interplanetary magnetic field (IMF) was dominated by a large positive By component, and for both events the electron
J. Moen (7594049) +3 more
core +4 more sources
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
doaj +1 more source
Polar cap patches and auroral blobs observed with Antarctic HF radars: Preliminary results [PDF]
, 1998 P(論文)We present preliminary results of the Antarctic HF radar observations of decameter-scale irregularities associated with polar cap patches and auroral blobs in the southern high latitude ionosphere.
Pinnock, Mike +7 more
core +1 more source
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
doaj +1 more source