Ionospheric response to geomagnetic storm of 28 May 2011. Multi-instrumental observations
Abstract
Though of moderate intensity, the geomagnetic storm of 28 May 2011 is one of the largest storms occurred in the 24th solar cycle. It started at 6UT with sudden drop of the IMF Bz component from +4 nT to -10 nT at 6:30UT. Overall, the IMF Bz remained negative till 14UT, reaching its minimum excursion of -13 nT at 11:10UT. During this period, the Ey component of the IEF varied from +4 to +7 mV/m. A long-term combination of southward IMF Bz and eastward IEF Ey provoked a moderate geomagnetic storm with the minimum of Dst excursion of -95 nT (reached by 11:10UT). In our work, we use data of satellite missions (satellite altimeters Jason-1 and Jason-2, COSMIC), as well as ground-based instruments in order to study the ionospheric behavior during the storm of 28 May 2011 on the global scale. Our preliminary results show signatures of the positive storm with TEC increase by 15% comparing to previous undisturbed days. We notice the hemispheric asymmetry in the dayside ionospheric response during the main phase of the storm. We also observe a short-time TEC enhancement in the equatorial region, with well-developed crests of the equatorial ionization anomaly around the 20 LT sector, which might indicate on pre-reversal enhancement of the zonal electric fields.
- Publication:
-
40th COSPAR Scientific Assembly
- Pub Date:
- 2014
- Bibcode:
- 2014cosp...40E.142A