@Article{AdhikariSapBarChaBra:2017:ImCoIn,
author = "Adhikari, Binod and Sapkota, Nirakar and Baruwal, Prashrit and
Chapagain, Narayan P. and Braga, Carlos Roberto",
affiliation = "{Tribhuvan University} and St. Xavier’s College, Maitighar and
{Tribhuvan University} and {Tribhuvan University} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Impacts on cosmic-ray intensity observed during geomagnetic
disturbances",
journal = "Solar Physics",
year = "2017",
volume = "292",
number = "10",
pages = "Article number 149",
month = "Oct.",
keywords = "Geomagnetic disturbances, Storm, Substorm, Moderate storm,
HILDCAA, Neutron monitor data.",
abstract = "Geomagnetic disturbances are the results of interplanetary causes
such as highspeed streamers (HSSs), interplanetary coronal mass
ejections (ICMEs), corotating interaction regions (CIRs), and
magnetic clouds. During different forms of geomagnetic
disturbances, we observed changes in the count rate at neutron
monitors that are kept at various locations. We studied the count
rates measured by neutron monitors at four stations at various
latitudes during different categories of geomagnetic events and
compared them. We analysed five events: a geomagnetically quiet
event, a non-storm high-intensity long-duration continuous AE
activity (HILDCAA) event, a storm-preceded HILDCAA event, a
geomagnetic substorm event, and a geomagnetic moderate storm
event. We based our analysis on geomagnetic indices, solar wind
parameters, and interplanetary magnetic field (IMF) parameters. We
found that the strength of the modulation was least during the
quiet event and highest during the storm-preceded HILDCAA. By
analysing the cause of these geomagnetic disturbances, we related
each decrease in the neutron monitor data with the corresponding
solar cause. For the ICME-driven storm, we observed a decrease in
neutron monitor data ranging from 6% to 12% in all stations. On
the other hand, we observed a decrease ranging from 2% to 5% for
the HSS-driven storm. For the non-storm HILDCAA, we observed a
decrease in neutron monitor data of about 1% to 1.5%. For the
quiet event, the neutron monitor data fluctuated such that there
was no overall decrease in all stations.",
doi = "10.1007/s11207-017-1183-3",
url = "http://dx.doi.org/10.1007/s11207-017-1183-3",
issn = "0038-0938 and 1573-093X",
language = "en",
targetfile = "binod_impacts.pdf",
urlaccessdate = "19 mar. 2024"
}