scholarly journals Latitudinal variations of TEC over Europe obtained from GPSobservations

2004 ◽  
Vol 22 (2) ◽  
pp. 405-415 ◽  
Author(s):  
P. Wielgosz ◽  
L. W. Baran ◽  
I. I. Shagimuratov ◽  
M. V. Aleshnikova
Keyword(s):  
Key Words ◽  
Gps Data ◽  
Ionospheric Disturbances ◽  
Iri Model ◽  
Latitudinal Dependence ◽  
Latitudinal Variations

Abstract. GPS technique has opened broad possibilities to study the TEC distribution on a regular basis. In this paper, the latitudinal dependence of TEC over Europe for geographic latitudes ranging from 40°N to 75°N is presented. We discuss the day-to-day variations of the latitudinal TEC profiles for a period of 1999 to 2001 for both quiet and disturbed magnetic conditions. More than 4300 TEC profiles were created from the TEC maps with a one-hour interval. GPS data from 65 European permanent stations were used to produce the TEC maps. The comparison of GPS-derived TEC profiles with the IRI model is also discussed. Key words. Ionosphere (mid-latitude ionosphere; ionospheric disturbances)

scholarly journals Two-dimensional imaging of large-scale traveling ionospheric disturbances over China based on GPS data

2012 ◽  
Vol 117 (A8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Feng Ding ◽  
Weixing Wan ◽  
Baiqi Ning ◽  
Biqiang Zhao ◽  
Qiang Li ◽  
...  
Keyword(s):  
Large Scale ◽  
Gps Data ◽  
Ionospheric Disturbances ◽  
Two Dimensional ◽  
Traveling Ionospheric Disturbances

scholarly journals Pre-earthquake ionospheric anomalies registered by continuous GPS TEC measurements

2004 ◽  
Vol 22 (5) ◽  
pp. 1585-1593 ◽  
Author(s):  
J. Y. Liu ◽  
Y. J. Chuo ◽  
S. J. Shan ◽  
Y. B. Tsai ◽  
Y. I. Chen ◽  
...  
Keyword(s):  
Key Words ◽  
Global Positioning System ◽  
Electron Content ◽  
Ionospheric Disturbances ◽  
Positioning System ◽  
Total Electron ◽  
Gps Tec ◽  
Global Positioning ◽  
Continuous Gps ◽  
Large Earthquakes

Abstract. In this paper we examine pre-earthquake ionospheric anomalies by the total electron content (TEC) derived from a ground-based receiver of the Global Positioning System (GPS). A 15-day running median of the TEC and the associated inter-quartile range (IQR) are utilized as a reference for identifying abnormal signals during all of the 20M≥6.0 earthquakes in the Taiwan area from September 1999 to December 2002. Results show that the pre-earthquake ionospheric anomalies appear during 18:00–22:00LT (LT=UT+8h) within 5 days prior to 16 of the 20M≥6.0 earthquakes. This success rate of 80% (=16/20%) suggests that the GPS TEC is useful to register pre-earthquake ionospheric anomalies appearing before large earthquakes. Key words. Ionosphere (ionospheric disturbances; ionosphere-atmosphere interactions)

scholarly journals Airglow observations over the equatorial ionization anomaly zone in Taiwan

2011 ◽  
Vol 29 (5) ◽  
pp. 749-757 ◽  
Author(s):  
J. Y. Liu ◽  
P. K. Rajesh ◽  
I. T. Lee ◽  
T. C. Chow
Keyword(s):  
Global Positioning System ◽  
Ionospheric Disturbances ◽  
Iri Model ◽  
Plasma Bubbles ◽  
Equatorial Ionization Anomaly ◽  
Equatorial Plasma Bubbles ◽  
Global Positioning ◽  
Plasma Depletions ◽  
First Time ◽  
Eastern Wall

Abstract. Airglow imaging at mid-latitude stations often show intensity modulations associated with medium scale travelling ionospheric disturbances (MSTID), while those carried out near the equatorial regions reveal depletions caused by equatorial plasma bubbles (EPB). Two all sky cameras are used to observe plasma depletions in the 630.0 nm emission over the equatorial ionization anomaly (EIA) region, Taiwan (23° N, 121° E; 13.5° N Magnetic) during 1998–2002 and 2006–2007. The results show EPB and MSTID depletions in different solar activity conditions. Several new features of the EPB depletions such as bifurcation, secondary structure on the walls, westward tilt, etc., are discussed in this paper. Evidence of tilted depletions with secondary structures developing on the eastern wall that later evolve to appear as bifurcations, are presented for the first time. Moreover, detail investigations are carried out using International Reference Ionosphere (IRI) model as well as the electron density from Ionosonde and Global Positioning System (GPS) Occultation Experiment (GOX) onboard FORMOSAT-3/COSMIC satellite, to understand the conditions that favor the propagation of MSTID to the latitude of Taiwan.

Determination of traveling ionospheric disturbances of geomagnetic storm by using dual frequency GPS data

2008 ◽  
Author(s):  
Mohamad Huzaimy Jusoh ◽  
Faizatul Noor Abu Bakar ◽  
Ahmad Asari Sulaiman ◽  
Noor Hasimah Baba ◽  
Robi'atun Adayiah Awang ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Gps Data ◽  
Ionospheric Disturbances ◽  
Dual Frequency ◽  
Traveling Ionospheric Disturbances

Latitudinal variations of solar flux dependence in the topside plasma density: comparison between IRI model and observations

2002 ◽  
Vol 29 (6) ◽  
pp. 877-882 ◽  
Author(s):  
I. Iwamoto ◽  
H. Katoh ◽  
T. Maruyama ◽  
H. Minakoshi ◽  
S. Watari ◽  
...  
Keyword(s):  
Plasma Density ◽  
Solar Flux ◽  
Iri Model ◽  
Latitudinal Variations
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