GPS phase scintillation during the geomagnetic storm of March 17, 2015: The relation to auroral electrojet currents

Paul Prikryl, Reza Ghoddousi-Fard, Martin Connors, James M. Weygand, Donald W. Danskin, P. Thayyil Jayachandran, Evan G. Thomas, Mike Ruohoniem, Tibor Durgonics, Kjellmar Oksavik, Yongliang Zhang

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Abstract

Ionospheric irregularities cause rapid fluctuations of radio wave amplitude and phase that candegrade GPS positional accuracy and affect performance of radio communication and navigation systems. The ionosphere becomes particularly disturbed during geomagnetic storms caused by impacts of coronal mass ejections compounded by high-speed plasma streams from coronal holes. Geomagnetic storm of March 17, 2015 was the largest in the current solar cycle. The high-latitude ionosphere dynamics is studied using arrays of ground-based instruments including GPS receivers, HF radars, ionosondes, riometers and magnetometers. GPS phase scintillation index is computed for L1 signal sampled at the rate of 50 Hz by specialized GPS scintillation receivers of the Expanded Canadian High Arctic Ionospheric Network (ECHAIN). To further extend the geographic coverage, the phasescintillation proxy index is obtained from geodetic-quality GPS data sampled at 1 Hz. In the context of solar wind coupling to the magnetosphere-ionosphere system, it has been demonstrated that GPS phase scintillation is primarily enhanced in the cusp, tongue of ionization (TOI) broken into patches drawn into the polar cap from the dayside storm-enhanced plasma density (SED) and in the auroral oval during energetic particle precipitation events, substorms and pseudo-breakups in particular. In this paper we examine the relation to auroral electrojet currents observed by arrays of ground-based magnetometers and energetic particle precipitation observed by DMSP satellites. Equivalent ionospheric currents (EICs) are obtained from ground magnetometer data using the spherical elementary currents systems (SECS) technique developed by Amm and Viljanen (1999) that has been applied over the entire North American ground magnetometer network by Weygand et al.(2011).
Original languageEnglish
Publication date2016
Number of pages1
Publication statusPublished - 2016
EventJapan Geoscience Union Meeting 2016 - Makuhari Messe International Conference Hall, Chiba-city, Japan
Duration: 22 May 201626 May 2016

Conference

ConferenceJapan Geoscience Union Meeting 2016
LocationMakuhari Messe International Conference Hall
CountryJapan
CityChiba-city
Period22/05/201626/05/2016

Fingerprint

Dive into the research topics of 'GPS phase scintillation during the geomagnetic storm of March 17, 2015: The relation to auroral electrojet currents'. Together they form a unique fingerprint.

Cite this