Publication Date:
2017-04-04
Description:
During the ascending phase of solar cycle 24, a
series of interplanetary coronal mass ejections (ICMEs) in
the period 7–17 March 2012 caused geomagnetic storms
that strongly affected high-latitude ionosphere in the Northern
and Southern Hemisphere. GPS phase scintillation was
observed at northern and southern high latitudes by arrays
of GPS ionospheric scintillation and TEC monitors
(GISTMs) and geodetic-quality GPS receivers sampling at
1 Hz. Mapped as a function of magnetic latitude and magnetic
local time (MLT), the scintillation was observed in the
ionospheric cusp, the tongue of ionization fragmented into
patches, sun-aligned arcs in the polar cap, and nightside auroral
oval and subauroral latitudes. Complementing a companion
paper (Prikryl et al., 2015a) that focuses on the highlatitude
ionospheric response to variable solar wind in the
North American sector, interhemispheric comparison reveals
commonalities as well as differences and asymmetries between
the northern and southern high latitudes, as a consequence
of the coupling between the solar wind and magnetosphere.
The interhemispheric asymmetries are caused by the
dawn–dusk component of the interplanetary magnetic field
controlling the MLT of the cusp entry of the storm-enhanced
density plasma into the polar cap and the orientation relative
to the noon–midnight meridian of the tongue of ionization.
Description:
Published
Description:
657-670
Description:
2A. Fisica dell'alta atmosfera
Description:
JCR Journal
Description:
open
Keywords:
Ionosphere
;
ionospheric disturbance
;
ionospheric irregularities
;
polar ionosphere
;
01. Atmosphere::01.02. Ionosphere::01.02.07. Scintillations
;
05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction
;
05. General::05.07. Space and Planetary sciences::05.07.02. Space weather
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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