Abstract
The 2015 St. Patrick’s day storm was the first storm of solar cycle 24 to reach a level of “Severe” on the NOAA geomagnetic storm scale. The Norwegian Mapping Authority is operating a national real-time kinematic (RTK) positioning network and has in recent years developed software and services and deployed instrumentation to monitor space weather disturbances. Here, we report on our observations during this event. Strong GNSS (Global Navigation Satellite System) disturbances, measured by the rate-of-TEC index (ROTI), were observed at all latitudes in Norway on March 17th and early on March 18th. Late on the 18th, strong disturbances were only observed in northern parts of Norway. We study the ionospheric disturbances in relation to the auroral electrojet currents, showing that the most intense disturbances of GNSS signals occur on the poleward side of poleward-moving current regions. This indicates a possible connection to ionospheric polar cap plasma patches and/or particle precipitation caused by magnetic reconnection in the magnetosphere tail. We also study the impact of the disturbances on the network RTK and Precise Point Positioning (PPP) techniques. The vertical position errors increase rapidly with increasing ROTI for both techniques, but PPP is more precise than RTK at all disturbance levels.
Highlights
On 17–18 March 2015, the first storm of solar cycle 24 to reach the G4 level on the NOAA scale (Poppe 2000) occurred
We study the ionospheric disturbances in relation to the auroral electrojet currents, showing that the most intense disturbances of Global Navigation Satellite System (GNSS) signals occur on the poleward side of poleward-moving current regions
We study the impact of the disturbances on the network real-time kinematic (RTK) and Precise Point Positioning (PPP) techniques
Summary
On 17–18 March 2015, the first storm of solar cycle 24 to reach the G4 level on the NOAA scale (Poppe 2000) occurred. To disturb GPS signals, patches must contain small-scale plasma structures, with scale sizes of decameters to kilometers (Hey et al 1946; Basu et al 1990, 1998; Kintner et al 2007; Mushini et al 2012). These are formed by plasma instability processes under suitable conditions.
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