@Article{RastogiJanChaTriEri:2017:EfSoFl,
author = "Rastogi, R. G. and Janardhan, P. and Chandra, H. and Trivedi,
Nalin Babulal and Erick, Vidal",
affiliation = "{Physical Research Laboratory} and {Physical Research Laboratory}
and {Physical Research Laboratory} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Geofisico del Peru}",
title = "Effect of solar flare on the equatorial electrojet in eastern
Brazil region",
journal = "Journal of Earth System Science",
year = "2017",
volume = "126",
number = "4",
month = "June",
keywords = "Solar flare, equatorial electrojet.",
abstract = "The effect of solar flare, sudden commencement of magnetic storm
and of the disturbances ring current on the equatorial electrojet
in the Eastern Brazil region, where the ground magnetic
declination is as large as 20 degrees W is studied based on
geomagnetic data with one minute resolution from Bacabal during
November-December 1990. It is shown that the mean diurnal vector
of the horizontal field was aligned along 2 degrees E of north at
Huancayo and 30 degrees W of north at Bacabal during the month of
December 1990. Number of solar flares that occurred on 30 December
1990 indicated the direction of solar flare related Delta H vector
to be aligned along 5 degrees E of north at Huancayo and 28
degrees W of north at Bacabal. This is expected as the solar flare
effects are due to the enhanced conductivity in the ionosphere.
The SC at 2230 UT on 26 November 1990 produced a positive impulse
in Delta X and negative impulse in Delta Y at Bacabal with Delta H
vector aligned along 27 degrees W of north. At Huancayo the Delta
H vector associated with SC is aligned along 8 degrees E of north,
few degrees east to the alignment of the diurnal vector of H. The
magnetic storm that followed the SC had a minimum Dst index of
-150 nT. The corresponding storm time disturbance in Delta X at
Huancayo as well as at Bacabal were about -250 nT but Delta Y at
Bacabal was about +70 nT and very small at Huancayo, that give the
alignment of the H vector due to ring current about 16 degrees W
of north at Bacabal and almost along N-S at Huancayo. Thus
alignment of the Delta H vector due to ring current at Bacabal is
14 degrees E of the mean direction of Delta H vector during
December 1990. This is consistent with the direction of ring
current dependent on the dipole declination at the ring current
altitude which is about 5 degrees W of north over Bacabal and the
deviation of declination due to the ring current during disturbed
period given by the angle (psi-D).",
doi = "10.1007/s12040-017-0837-8",
url = "http://dx.doi.org/10.1007/s12040-017-0837-8",
issn = "0253-4126",
language = "en",
targetfile = "rastogi_effect.pdf",
urlaccessdate = "18 abr. 2024"
}