scholarly journals GPS-TEC Variation during Low to High Solar Activity Period (2010-2014) under the Northern Crest of Indian Equatorial Ionization Anomaly Region

Positioning ◽  
2017 ◽  
Vol 08 (02) ◽  
pp. 13-35 ◽  
Author(s):  
Nilesh C. Patel ◽  
Sheetal P. Karia ◽  
Kamlesh N. Pathak
Keyword(s):  
Solar Activity ◽  
Activity Period ◽  
High Solar Activity ◽  
Gps Tec ◽  
Equatorial Ionization Anomaly ◽  
Solar Activity Period ◽  
Anomaly Region

scholarly journals Comparison of IRI-2016 model with IGS VTEC maps during low and high solar activity period

2019 ◽  
Vol 12 ◽  
pp. 555-561 ◽  
Author(s):  
Chuang Shi ◽  
Tao Zhang ◽  
Cheng Wang ◽  
Zhipeng Wang ◽  
Lei Fan
Keyword(s):  
Solar Activity ◽  
Activity Period ◽  
High Solar Activity ◽  
Solar Activity Period

scholarly journals Evaluating the Performance of IRI-2016 Using GPS-TEC Measurements over the Equatorial Region

Atmosphere ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1243
Author(s):  
Nouf Abd Elmunim ◽  
Mardina Abdullah ◽  
Siti Aminah Bahari
Keyword(s):  
Solar Activity ◽  
Early Morning ◽  
Equatorial Region ◽  
Activity Period ◽  
High Solar Activity ◽  
Electron Content ◽  
Dual Frequency ◽  
Iri Model ◽  
Total Electron ◽  
Solar Activity Period

Total electron content (TEC) is an important parameter in the ionosphere that is extensively used to study the variability of the ionosphere as it significantly affects radio wave propagations, causing delays on GPS signals. Therefore, evaluating the performance of ionospheric models is crucial to reveal the variety of ionospheric behaviour in different solar activity periods during geomagnetically quiet and disturbed periods for further improvements of the IRI model performance over the equatorial region. This research aimed to investigate the variations of ionospheric VTEC and observe the improvement in the performance of the IRI-2016 (IRI-2001, IRI01-corr, and NeQuick). The IRI-2016 was evaluated with the IRI-2012 using NeQuick, IRI-2001, and IRI01-corr topside electron density options. The data were obtained using a dual-frequency GPS receiver installed at the Universiti Utara Malaysia Kedah (UUMK) (geographic coordinates 4.62° N–103.21° E, geomagnetic coordinates 5.64° N–174.98° E), Mukhtafibillah (MUKH) (geographic coordinates 6.46° N–100.50° E, geomagnetic coordinates 3.32° S–172.99° E), and Tanjung Pengerang (TGPG) (geographic coordinates 1.36° N–104.10°E, geomagnetic coordinates 8.43° S–176.53° E) stations, during ascending to high solar activity at the geomagnetically quiet and disturbed periods in October 2011, March 2012, and March 2013. The maximum hourly ionospheric VTEC was observed during the post-noon time, while the minimum was during the early morning time. The ionospheric VTEC modelled by IRI-2016 had a slight improvement from the IRI-2012. However, the differences were observed during the post-noon and night-time, while the modelled VTEC from both IRI models were almost similar during the early morning time. Regarding the daily quiet and disturbed period’s prediction capability of the IRI-2016 and IRI-2012, IRI-2016 gave better agreement with the measured VTEC. The overall results showed that the model’s prediction performance during the high solar activity period in 2013 was better than the one during the ascending solar activity period. The results of the comparison between IRI-2016 and IRI-2012 in high solar activity exhibited that during quiet periods, all the IRI models showed better agreement with the measured VTEC compared to the disturbed periods.

Thermospheric temperature during a high solar activity period

Eos ◽  
1990 ◽  
Vol 71 (39) ◽  
pp. 1100 ◽  
Author(s):  
J. S. Kim ◽  
G. S. N. Murty ◽  
J. W. Kim ◽  
Y. Kim
Keyword(s):  
Solar Activity ◽  
Activity Period ◽  
High Solar Activity ◽  
Solar Activity Period

Day-to-day variability of equatorial anomaly in GPS-TEC during low solar activity period

2012 ◽  
Vol 49 (12) ◽  
pp. 1709-1720 ◽  
Author(s):  
Malini Aggarwal ◽  
H.P. Joshi ◽  
K.N. Iyer ◽  
Y.-S. Kwak ◽  
J.J. Lee ◽  
...  
Keyword(s):  
Solar Activity ◽  
Activity Period ◽  
Equatorial Anomaly ◽  
Gps Tec ◽  
Solar Activity Period

GPS-TEC variations during low solar activity period (2007–2009) at Indian low latitude stations

2012 ◽  
Vol 339 (1) ◽  
pp. 165-178 ◽  
Author(s):  
Sanjay Kumar ◽  
S. Priyadarshi ◽  
S. Gopi Krishna ◽  
A. K. Singh
Keyword(s):  
Solar Activity ◽  
Activity Period ◽  
Low Latitude ◽  
Gps Tec ◽  
Solar Activity Period
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