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Found 10 entries in the Bibliography.
Showing entries from 1 through 10
Seasonal Variation of Post-sunset and Post-midnight Equatorial Plasma Bubble in Malaysia during Moderate Solar Activity Level
The equatorial plasma bubble (EPB) is a common event that occurred at the F-layer of the ionosphere due to plasma irregularities. Its occurrence can be observed around sunset and midnight hours, depending on the season. In this study, ROTI plot measurement was utilized in EPB detection, where the data was obtained from the Department of Survey and Mapping Malaysia (JUPEM). The seasonal variation of EPB in Langkawi, Malaysia was investigated for both post-sunset and post-midnight occurrence within the period of moderate solar ...
Rosli, Nur; Hamid, Nurul; Abdullah, Mardina; Buhari, Suhaila; Sarudin, Idahwati;
Published by: Published on: nov
YEAR: 2021   DOI: 10.1109/IconSpace53224.2021.9768743
solar activity; equatorial plasma bubble (EPB); GPS; Ionosphere; Plasma measurements; Plasmas; post-midnight; Southeast Asia; Time-frequency analysis
Plasma depletions lasting into daytime during the recovery phase of a geomagnetic storm in May 2017: Analysis and simulation of GPS total electron content observations
This paper reports that plasma density depletions appearing at middle latitudes near sunrise survived until afternoon on 29 May 2017 during the recovery phase of a geomagnetic storm. By analyzing GPS data collected in Japan, we investigate temporal variations in the horizontal two-dimensional distribution of total electron content (TEC) during the geomagnetic storm. The SYM-H index reached −142 nT around 08 UT on 28 May 2017. TEC depletions extending up to approximately 38°N along the meridional direction appeared over Ja ...
Otsuka, Yuichi; Shinbori, Atsuki; Sori, Takuya; Tsugawa, Takuya; Nishioka, Michi; Huba, Joseph;
Published by: Earth and Planetary Physics Published on:
YEAR: 2021   DOI: 10.26464/epp2021046
Ionosphere; GPS; ionospheric irregularity; plasma bubble; SAMI2
Dependence of the high-latitude plasma irregularities on the auroral activity indices: a case study of 17 March 2015 geomagnetic storm
The magnetosphere substorm plays a crucial role in the solar wind energy dissipation into the ionosphere. We report on the intensity of the high-latitude ionospheric irregularities during one of the largest storms of the current solar cycle\textemdashthe St. Patrick\textquoterights Day storm of 17 March 2015. The database of more than 2500 ground-based Global Positioning System (GPS) receivers was used to estimate the irregularities occurrence and dynamics over the auroral region of the Northern Hemisphere. We analyze the ...
Cherniak, Iurii; Zakharenkova, Irina;
Published by: Earth, Planets and Space Published on: 12/2015
YEAR: 2015   DOI: 10.1186/s40623-015-0316-x
Auroral hemispheric power index Auroral precipitation; geomagnetic storm; GPS; Ionosphere irregularities; ROTI
The global morphology of the plasmaspheric electron content during Northern winter 2009 based on GPS/COSMIC observation and GSM TIP model results
We studied the contribution of the global plasmaspheric and ionospheric electron content (PEC and IEC) into total electron content (TEC). The experimental PEC was estimated by comparison of GPS TECobservations and FORMOSAT-3/COSMIC radio occultation IEC measurements. Results are retrieved for the winter solstice (January and December 2009) conditions. Global maps of COSMIC-derived IEC, PECand GPS TEC were compared with Global Self-consistent ...
Klimenko, M.V.; Klimenko, V.V.; Zakharenkova, I.E.; Cherniak, Iu.V.;
Published by: Advances in Space Research Published on: 06/2014
YEAR: 2015   DOI: 10.1016/j.asr.2014.06.027
FORMOSAT-3/COSMIC; GPS; Numerical modeling; Plasmasphere; total electron content
A study of GPS ionospheric scintillations observed at Shenzhen
Ionospheric scintillation variations are studied using GPS measurements at the low latitude station of Shenzhen (22.59\textdegreeN,\ 113.97\textdegreeE), situated under the northern crest of the equatorial anomaly region, from the Chinese Meridian Project. The results are presented for data collected during the current phase of rising solar activity (low to high solar activity) from December 2010 to April 2014. The results show that GPS scintillation events were largely a nighttime phenomenon during the whole observa ...
Huang, Linfeng; Wang, Jinsong; Jiang, Yong; Chen, Zhou; Zhao, Kai;
Published by: Advances in Space Research Published on: 12/2014
YEAR: 2014   DOI: 10.1016/j.asr.2014.08.023
GPS L1-Frequency Observations of Equatorial Scintillations and Irregularity Zonal Velocities
In this work, the climatology of ionospheric scintillations at global positioning system (GPS) L-band frequency and the zonal drift velocities of scintillation-producing irregularities were depicted for the equatorial observatory of S\~ao Luis (2.33\textdegreeS; 44.21\textdegreeW; dip latitude 1.3\textdegreeS), Brazil. This is the first time that the hourly, monthly, and seasonal variations of scintillations and irregularity zonal drifts at S\~ao Luis were characterized during periods of different solar activity levels (f ...
Muella, Marcio; de Paula, Eurico; Jonah, Olusegun;
Published by: Surveys in Geophysics Published on: 08/2014
YEAR: 2014   DOI: 10.1007/s10712-013-9252-0
GPS; Ionospheric drifts; ionospheric irregularities; Ionospheric scintillation
GPS TEC near the crest of the EIA at 95\textdegreeE during the ascending half of solar cycle 24 and comparison with IRI simulations
Total electron content (TEC) data obtained from GPS dual frequency measurements during the ascending half of the solar cycle 24 from 2009 to 2012 over Dibrugarh (27.5\textdegreeN, 94.9\textdegreeE; 17.6\textdegreeN MLAT) have been used to study the diurnal, seasonal, annual and solar cycle variation of TEC. The measurements reported here are for the first time from the location situated at the poleward edge of the northern equatorial ionization anomaly (EIA) and within the peak region of the longitudinal wave number 4 (WN ...
Bhuyan, Pradip; Hazarika, Rumajyoti;
Published by: Advances in Space Research Published on: 10/2013
YEAR: 2013   DOI: 10.1016/j.asr.2013.06.029
GPS-TEC variations during low solar activity period (2007--2009) at Indian low latitude stations
The paper is based on the ionospheric variations in terms of vertical total electron content (VTEC) for the low solar activity period from May 2007 to April 2009 based on the analysis of dual frequency signals from the Global Positioning System (GPS) satellites recorded at ground stations Varanasi (Geographic latitude 25\textd ...
Kumar, Sanjay; Priyadarshi, S.; Krishna, Gopi; Singh, A.;
Published by: Astrophysics and Space Science Published on: 05/2012
YEAR: 2012   DOI: 10.1007/s10509-011-0973-6
geomagnetic storm; GPS; Ionospheric total electron contents; IRI model
Ionospheric scintillations at Guilin detected by GPS ground-based and radio occultation observations
The occurrence of ionospheric scintillations with S4⩾0.2 was studied using GPS measurements at Guilin, China (25.29°N, 110.33°E; geomagnetic: 15.04°N, 181.98°E), a station located near the northern crest of the equatorial anomaly. The results are presented for data collected from January 2009 to March 2010. The results show that nighttime amplitude scintillations only took place in February and March of the considered years, while daytime amplitude scintillations occurred in August and December of 2009. Nighttime ampli ...
Published by: Advances in Space Research Published on:
YEAR: 2011   DOI: https://doi.org/10.1016/j.asr.2010.11.016
Ionospheric scintillation; ionospheric irregularities; GPS; GPS-COSMIC radio occultation
GPS observations of the ionospheric F2-layer behavior during the 20th November 2003 geomagnetic storm over South Korea
The ionospheric F2-layer peak density (NmF2) and its height (hmF2) are of great influence on the shape of the ionospheric electron density profile Ne (h) and may be indicative of other physical processes within the ionosphere, especially those due to geomagnetic storms. Such parameters are often estimated using models such as the semiempirical international reference ionosphere (IRI) models or are measured using moderately priced to expensive instrumentation, such as ionosondes or incoherent scatter radars. Global positio ...
Jin, Shuanggen; Luo, O.; Park, P.;
Published by: Journal of Geodesy Published on: 03/2008
YEAR: 2008   DOI: 10.1007/s00190-008-0217-x