Ionospheric Regions Producing Anomalous GNSS Radio Occultation Results

Norman, R, Carter, B, Healy, S, Culverwell, I, Von Engeln, A, Le Marshall, J, Younger, J, Cate, A and Zhang, K 2018, 'Ionospheric Regions Producing Anomalous GNSS Radio Occultation Results', IEEE Transactions on Geoscience and Remote Sensing, vol. 56, no. 12, pp. 7350-7358.

Document type: Journal Article
Collection: Journal Articles

Title Ionospheric Regions Producing Anomalous GNSS Radio Occultation Results
Author(s) Norman, R
Carter, B
Healy, S
Culverwell, I
Von Engeln, A
Le Marshall, J
Younger, J
Cate, A
Zhang, K
Year 2018
Journal name IEEE Transactions on Geoscience and Remote Sensing
Volume number 56
Issue number 12
Start page 7350
End page 7358
Total pages 9
Publisher IEEE
Abstract Anomalous GPS radio occultation (RO) events are characterised as those with L1 bending angle greater than their corresponding L2 bending angle. An investigation by EUMETSAT and the United Kingdom Meteorological Office revealed there are regions in the earths atmosphere where at times up to 60% of Global Navigation Satellite System Receiver for Atmospheric Sounding RO events, at the Tangent Point height of 50 km, exhibited anomalous bending angle results. The exact source of these anomalous RO events has been unclear to the RO data user community, i.e., data processing artifact or atmospheric phenomenon. In this paper, the regions of increased occurrence of anomalous RO have been identified to be the mid-latitude ionospheric trough, ionospheric polar hole, and poleward edges of the equatorial anomaly. They are more frequent at nighttime and in the southern hemisphere winter months. This is when the plasma density in these regions is depleted. However, within these regions, there are ionospheric features of increased electron density gradients such as at the walls of the mid-latitude ionospheric trough. 3-D numerical ray tracing simulations of GPS RO are presented, showing that these increased electron density features in a weakly ionized ionosphere can produce the anomalous bending angle results.
Subject Geodesy
Keyword(s) Atmosphere
global positioning system
low earth orbit (LEO) satellites
radiowave propagation
ray tracing
DOI - identifier 10.1109/TGRS.2018.2850942
Copyright notice © 2018 IEEE
ISSN 0196-2892
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