Exploring ionospheric plasma density trends in the Indian equatorial crest region under varying solar activity conditions

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216208:11320/24:10490124

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Exploring ionospheric plasma density trends in the Indian equatorial crest region under varying solar activity conditions

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Exploring ionospheric plasma density trends in the Indian equatorial crest region under varying solar activity conditions

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Atmospheric and Solar-Terrestrial Physics

ISSN

1364-6826

e-ISSN

1879-1824

Svazek periodika

262

Číslo periodika v rámci svazku

Sept.

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

106266

Kód UT WoS článku

001275528200001

EID výsledku v databázi Scopus

2-s2.0-85198907098