MULTIFREQUENCY EQUATORIAL IONOSPHERIC SCINTILLATIONS IN AMERICAN AND INDIAN ZONES

1980 ◽  
pp. 201-204 ◽  
Author(s):  
R.G. Rastogi ◽  
J. Aarons ◽  
H.E. Whitney ◽  
J.P. Mullen ◽  
J. Pantoja ◽  
...  
Keyword(s):  
Ionospheric Scintillations

APPLICATION OF AN IMAGING RIOMETER TO INVESTIGATING STIMULATED IONOSPHERIC SCINTILLATIONS AND ABSORPTION OF RADIATION FROM DISCRETE COSMIC SOURCES

2010 ◽  
Vol 1 (4) ◽  
pp. 291-302 ◽  
Author(s):  
V. G. Bezrodny ◽  
O. V. Charkina ◽  
Yu. M. Yampolski ◽  
B. Watkins ◽  
K. Groves
Keyword(s):  
Ionospheric Scintillations

scholarly journals First Observations of GNSS Ionospheric Scintillations From DemoGRAPE Project

Space Weather ◽  
2016 ◽  
Vol 14 (10) ◽  
pp. 704-709 ◽  
Author(s):  
L. Alfonsi ◽  
P. J. Cilliers ◽  
V. Romano ◽  
I. Hunstad ◽  
E. Correia ◽  
...  
Keyword(s):  
Ionospheric Scintillations

Ionospheric Scintillations: Indices and Modelling

Radio Science ◽  
2019 ◽  
Author(s):  
Yannick Béniguel
Keyword(s):  
Ionospheric Scintillations

scholarly journals Study of spatial and temporal characteristics of L-band scintillations over the Indian low-latitude region and their possible effects on GPS navigation

2006 ◽  
Vol 24 (6) ◽  
pp. 1567-1580 ◽  
Author(s):  
P. V. S. Rama Rao ◽  
S. Gopi Krishna ◽  
K. Niranjan ◽  
D. S. V. V. D. Prasad
Keyword(s):  
Indian Region ◽  
Sunspot Activity ◽  
Navigation Systems ◽  
Positional Accuracy ◽  
Band Frequency ◽  
Latitude Range ◽  
Ionospheric Scintillations ◽  
Simultaneous Study ◽  
L Band ◽  
Spatio Temporal

Abstract. The scintillation data (S4-index) at the L-band frequency of 1.575GHz, recorded from a total of 18 GPS receivers installed at different locations in India under the GAGAN project, have provided us with a unique opportunity, for the first time in the Indian region, to make a simultaneous study of spatio-temporal and intensity characteristics of the trans-ionospheric scintillations during the 18-month, low sunspot activity (LSSA) period from January 2004 to July 2005. During this period, the occurrence of scintillations is found to be maximum around the pre-midnight hours of equinox months, with very little activity during the post-midnight hours. No significant scintillation activity is observed during the summer and winter months of the period of observation. The intensity (S4 index) of the scintillation activity is stronger around the equatorial ionization anomaly (EIA) region in the geographic latitude range of 15° to 25° N in the Indian region. These scintillations are often accompanied by the TEC depletions with durations ranging from 5 to 25 min and magnitudes from 5 to 15 TEC units which affect the positional accuracy of the GPS by 1 to 3 m. Further, during the intense scintillation events (S4>0.45≈10 dB), the GPS receiver is found to lose its lock for a short duration of 1 to 4 min, increasing the error bounds effecting the integrity of the SBAS operation. During the present period of study, a total of 395 loss of lock events are observed in the Indian EIA region; this number is likely to increase during the high sunspot activity (HSSA) period, creating more adverse conditions for the trans-ionospheric communications and the GPS-based navigation systems.

A study of ionospheric scintillations of phase and quadrature components

1979 ◽  
Vol 84 (A5) ◽  
pp. 2039 ◽  
Author(s):  
W. J. Myers ◽  
R. J. Gjeldum ◽  
C. H. Liu ◽  
K. C. Yeh
Keyword(s):  
Ionospheric Scintillations

scholarly journals Comparison of GPS TEC with IRI models of 2007, 2012, AND 1 2016 over Sukkur, Pakistan

2020 ◽  
Vol 1 (1) ◽  
pp. 1-10
Author(s):  
Adil Hussain ◽  
Munawar Shah
Keyword(s):  
Global Positioning System ◽  
Electron Content ◽  
Iri Model ◽  
Low Latitude ◽  
Total Electron ◽  
Gps Tec ◽  
Global Positioning ◽  
Radio Signals ◽  
Ionospheric Scintillations ◽  
Latitude Region

The international reference ionosphere (IRI) models have been widely used for correcting the ionospheric scintillations at different altitude levels. An evaluation on the performance of VTEC correction from IRI models (version 2007, 2012 and 2016) over Sukkur, Pakistan (27.71º N, 68.85º E) is presented in this work. Total Electron Content (TEC) from IRI models and GPS in 2019 over Sukkur region are compared. The main aim of this comparative analysis is to improve the VTEC in low latitude Sukkur, Pakistan. Moreover, this study will also help us to identify the credible IRI model for the correction of Global Positioning System (GPS) signal in low latitude region in future. The development of more accurate TEC finds useful applications in enhancing the extent to which ionospheric influences on radio signals are corrected. VTEC from GPS and IRI models are collected between May 1, 2019 and May 3, 2019. Additionally, Dst and Kp data are also compared in this work to estimate the geomagnetic storm variations. This study shows a good correlation of 0.83 between VTEC of GPS and IRI 2016. Furthermore, a correlation of 0.82 and 0.78 is also recorded for IRI 2012 and IRI 2007 respectively, with VTEC of GPS. The IRI TEC predictions and GPS-TEC measurements for the studied days reveal the potential of IRI model as a good candidate over Pakistan.

Ionospheric Scintillations At Equatorial And Low Latitudes In India

2001 ◽  
Author(s):  
K.N. Iyer ◽  
M.A. Abdu ◽  
J.R. de Souza ◽  
M.N. Jivani ◽  
B.M. Pathan
Keyword(s):  
Low Latitudes ◽  
Ionospheric Scintillations
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