Abstract
The influence of an auroral substorm on the total electron content (TEC) jumps and cycle slips on Global Positioning System (GPS) at high-latitudes is studied. For the first time, optical data from the all-sky imager, as well as interplanetary magnetic field and magnetometer data are used to complete the analysis of the slips occurrence and to monitor the substorm evolution. Two types of slips are considered: (i) instrumental slips including losses in the measured phase of the GPS signal and (ii) sharp TEC variations (TEC jumps) It is demonstrated that the jumps in TEC determined from the GPS signals are mainly related to the auroral particle precipitation that normally occurs during geomagnetic substorms in the polar ionosphere. The GPS frequency {L}_{2} is consistently subject to more slips than frequency {L}_{1} both for quiet and disturbed conditions. The probability of TEC jumps is higher than for cycle slips in phase at frequencies {L}_{1} and {L}_{2}. The maximum of TEC jumps is observed during the recovery phase of the auroral substorm. Our findings are based on a data set obtained for a particular event. A generalization of the obtained numerical estimates to other events requires additional research and further analysis.
Highlights
The influence of an auroral substorm on the total electron content (TEC) jumps and cycle slips on Global Positioning System (GPS) at high-latitudes is studied
We study in detail the effects of a geomagnetic substorm that occurred on December 23, 2014, between 19:00 and 23:59 universal time (UT), on the slips in phases L1 and L2 as well as TEC jumps at high latitudes
The present study focused on the response of the GPS signals to the disturbed conditions in the high-latitude ionosphere, with the focus on the relationship between the occurrence of TEC jumps determined by GPS signal and the evolution of a geomagnetic substorm on December 23, 2014
Summary
The influence of an auroral substorm on the total electron content (TEC) jumps and cycle slips on Global Positioning System (GPS) at high-latitudes is studied. The Global Positioning System (GPS) uses two frequencies: f1 = 1575.42 MHz and f2 = 1227.60 MHz, and provides high accuracy measurements primarily of the phase advance that occurs along the line of sight between the ground-based receiver and the transmitters onboard the GPS satellite[1,2,3]. Such measurements can be done simultaneously by the two frequency receivers at almost every point of the globe at any time. It is important to carry out detailed studies of ionospheric effects on the navigation signal propagation at high–latitudes[11,21,22]
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