Warning and Mitigation Technologies for Travelling Ionospheric Disturbances Effects — TechTIDE › Forums › TechTIDE Forum › September 2017 ionospheric perturbation events
Tagged: September 2017 analysis report
October 29, 2018 at 1:46 pm #3486
A series of disturbances occurred in September 2017, initiated with a solar flare on 6 September. We welcome inputs with observations from the solar-magnetosphere-ionosphere coupled system, and remarks on the effects in aerospace and ground systems.November 6, 2018 at 9:43 am #3487
The research group of Astronomy and GEomatics (gAGE/UPC) has analyzed the impact of the solar flare occurred in September 6 th of 2017 (day of year 249) in three navigation systems: EGNOS (the European SBAS system), PPP and NRTK.
The basic conclusion of the study is that the Solar flare, itself, shouldn’t have a direct impact in any of the 3 navigation systems: we have only found impacts in technical aspects linked indirectly to the Solar flare (i.e. the fast increasing of the STEC) and could be corrected with an adequate treatment. These impacts are:
– Some receivers are unable to track fast changes in the STEC and present multiple loss of lock on practically all the measurements affected by the Solar flare. This is the case for the EGNOS RIMS-A receivers but not for the EGNOS RIMS-B receivers that keep up the tracking during the Solar flare.
– In high accuracy services, as PPP or RTK, if the cycle slip detector tool is based on the geometry-free combination and works over data collected at low rate, the sudden variation of STEC can be erroneously interpreted as cycle slips. This erroneous detection degrades the navigation solutions. However, this not occur if the data were collected at higher rates.
Full study is presented in the attached document.
For further information, contact Miguel Juan at firstname.lastname@example.org
Attachments:You must be logged in to view attached files.December 18, 2018 at 2:25 pm #3500
A Coronal Mass Ejection was associated to the solar flare occurred on September 6th 2017, which produced a significant impact in the EGNOS performance on the two following days, the 7th and 8th of September. If we focus on September 8th, the values of geomagnetic index Kp and rate of TEC index can perfectly match with the EGNOS availability degradation in the North of Europe. The analysis showed that the EGNOS degradation is linked to the GPS L2 loss of lock by some receivers in the North caused by a high TEC gradients produced by the impact of the CME in the upper atmosphere. Additionally, does this CME generate any other type of irregularity in the ionosphere (e.g. TID)?
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