Solar flare is referring to sun's activity define as sudden intense bright light coming from its surface. It can immediately affect earth's ionosphere system thus perturb any currents flowing in the layer. The activity can be monitored using ground based magnetometer data. Regularly, the event will enhance the ionospheric conductivity thus increase the magnitude of the currents however the opposite effect has been reported recently. There were studies reported that a solar flare is capable to increase current intensity at some location and reduces it at other location. Previous study were focused on solar flare effect at some particular area sector or locally. Therefore, our approach is to analyze solar flare feature and its effect using extensive magnetometer data distribution which involve stations from five sectors. Data are obtained from Magnetic Data Acquisition System/Circum-pan Pacific Magnetometer Network (MAGDAS/CPMN) and solar flare is identified using Geostationary Operational Environmental Satellite 15 (GOES 15) X-ray flux data. Our study discovered a new effect of solar flare which is reduction of current intensity at all magnetic equator data and the proposed factor is existence of counter electrojet current. Apart from that, we also found that this solar flare occurred on geomagnetic storm recovery phase during June solstice in inclining phase of solar cycle.
|Translated title of the contribution
|Observation of ionospheric current during strong solar flare using ground based magnetometer
|Number of pages
|Published - Mar 2018
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