The Solar Event of 14 – 15 July 2012 and Its Geoeffectiveness

During Solar Cycle 24, which started at the end of 2008, the Sun was calm, and there were not many spectacular geoeffective events. In this article, we analyze the geomagnetic storm that happened on 15 July 2012 during the 602nd anniversary of the Polish Battle of Grunwald, thus we propose this even...

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Bibliographic Details
Published in:Solar physics 2020-10, Vol.295 (10), Article 135
Main Authors: Gil, Agnieszka, Modzelewska, Renata, Moskwa, Szczepan, Siluszyk, Agnieszka, Siluszyk, Marek, Wawrzynczak, Anna, Pozoga, Mariusz, Tomasik, Lukasz
Format: Article
Language:English
Subjects:
Astrophysics and Astroparticles
Atmospheric Sciences
Coronagraphs
Coronal mass ejection
DST Index
Geomagnetic storms
Geomagnetism
Heliospheric magnetic field
Magnetic fields
Magnetic storms
Physics
Physics and Astronomy
Solar cycle
Solar flares
Solar physics
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Storms
Transmission lines
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Summary:During Solar Cycle 24, which started at the end of 2008, the Sun was calm, and there were not many spectacular geoeffective events. In this article, we analyze the geomagnetic storm that happened on 15 July 2012 during the 602nd anniversary of the Polish Battle of Grunwald, thus we propose this event to be called the “Battle of Grunwald Day Storm”. According to NOAA scale, it was a G3 geomagnetic storm with a southward component of the heliospheric magnetic field, B z , falling to −20 nT, minimum Dst index of −139 nT, AE index of 1368 nT, and Ap index of 132 nT. It was preceded by a solar flare class X1.4 on 12 July. This geomagnetic storm was associated with the fast halo coronal mass ejection at 16:48:05 UT on 12 July, first appearance in the Large Angle and Spectroscopic Coronagraph C2, with a plane-of-sky speed of 885 km s −1 and maximum of 1415 km s −1 . This geomagnetic storm was classified as the fourth strongest geomagnetic storm of Solar Cycle 24. At that time, a significant growth in the failures of the Polish electric transmission lines was observed, which could have a solar origin.
ISSN:0038-0938
1573-093X
DOI:10.1007/s11207-020-01703-2