Exploring ionospheric plasma density trends in the Indian equatorial crest region under varying solar activity conditions
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F24%3A00588161" target="_blank" >RIV/68378289:_____/24:00588161 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/24:10490124
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S1364682624000944" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1364682624000944</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jastp.2024.106266" target="_blank" >10.1016/j.jastp.2024.106266</a>
Alternative languages
Result language
angličtina
Original language name
Exploring ionospheric plasma density trends in the Indian equatorial crest region under varying solar activity conditions
Original language description
Long-term trends in the evolution of ionospheric plasma at Hyderabad (17.38 degrees N, 78.48 degrees E, 8.52 degrees N Magnetic Latitude), a near-equatorial anomaly (EIA) crest region of the Indian ionospheric sector, have been studied using 9 years of vertical Total Electron Content (TEC) data from 2004 to 2009 and 2011 to 2013 using global positioning satellites (GPS) measurements. The study examined the mean diurnal, monthly, seasonal, and yearly variations of TEC during geomagnetic quiet days in different seasons from 2004 to 2013. The findings reveal that the daytime TEC at the anomaly crest region exhibits semi-annual variations throughout the study period, while midnight TEC shows semi-annual variation only during the high solar activity years of 2011-2013. The winter anomaly was observed in 2004 and 2006. The study also assessed the performance of the International Reference Ionosphere (IRI) 2016 model in reproducing GPS TEC variability at the equatorial crest region. The diurnal and seasonal variation patterns in IRI-TEC show a good correlation with GPS TEC. However, the IRI 2016 model tends to overestimate TEC values during low solar activity conditions (2006-2009) but represents TEC variations reasonably well during high solar activity periods (2011-2013). Nevertheless, the IRI model fails to capture the wide plateau-like structure in the peak TEC, typically occurring between 1200-1600 IST at Hyderabad. Additionally, IRI-TEC consistently indicates very low TEC values during the early morning hours, whereas GPS-TEC measurements suggest a significant presence of plasma density. The study suggests a strong influence of the solar cycle on TEC variations at Hyderabad, evident from the positive correlation (R2 = 0.71) with the F10.7 cm index. This characteristic is also well represented by the IRI 2016 model.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Atmospheric and Solar-Terrestrial Physics
ISSN
1364-6826
e-ISSN
1879-1824
Volume of the periodical
262
Issue of the periodical within the volume
Sept.
Country of publishing house
GB - UNITED KINGDOM
Number of pages
11
Pages from-to
106266
UT code for WoS article
001275528200001
EID of the result in the Scopus database
2-s2.0-85198907098