Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\26167429
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Geophys+Res+Space+Phys
2013 ; 118
(12
): 7928-7939
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Ionospheric redistribution during geomagnetic storms
#MMPMID26167429
Immel TJ
; Mannucci AJ
J Geophys Res Space Phys
2013[Dec]; 118
(12
): 7928-7939
PMID26167429
show ga
[1]The abundance of plasma in the daytime ionosphere is often seen to grow
greatly during geomagnetic storms. Recent reports suggest that the magnitude of
the plasma density enhancement depends on the UT of storm onset. This possibility
is investigated over a 7year period using global maps of ionospheric total
electron content (TEC) produced at the Jet Propulsion Laboratory. The analysis
confirms that the American sector exhibits, on average, larger storm time
enhancement in ionospheric plasma content, up to 50% in the afternoon
middle-latitude region and 30% in the vicinity of the high-latitude auroral cusp,
with largest effect in the Southern Hemisphere. We investigate whether this
effect is related to the magnitude of the causative magnetic storms. Using the
same advanced Dst index employed to sort the TEC maps into quiet and active
(Dst<-100 nT) sets, we find variation in storm strength that corresponds closely
to the TEC variation but follows it by 3-6h. For this and other reasons detailed
in this report, we conclude that the UT-dependent peak in storm time TEC is
likely not related to the magnitude of external storm time forcing but more
likely attributable to phenomena such as the low magnetic field in the South
American region. The large Dst variation suggests a possible system-level effect
of the observed variation in ionospheric storm response on the measured strength
of the terrestrial ring current, possibly connected through UT-dependent
modulation of ion outflow.
free
free
free
