Ionospheric Currents Flowing along the Terminator during Solar Flares

Details Ionospheric Currents Flowing along the Terminator during Solar Flares Ionospheric Currents Flowing along the Terminator during Solar Flares

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa33b1770y&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA33B-1770

Astronomy and Astrophysics

Astrophysics

[2409] Ionosphere / Current Systems, [2415] Ionosphere / Equatorial Ionosphere, [2437] Ionosphere / Ionospheric Dynamics, [7519] Solar Physics, Astrophysics, And Astronomy / Flares

Scientific paper

Solar flares occasionally produce geomagnetic disturbances known as “solar flare effects” (sfe). Flare electromagnetic radiation causes the ionization enhancement mainly in the sunlit hemisphere, resulting in the enhancement of ionospheric currents. The amplitude of sfe at the dip equator sometimes reaches 100 nT from an large solar flare. Such large sfe events from 2000 to 2005 (three events) were examined using these extended magnetometer networks: (1) the Circum-pan Pacific Magnetometer Network (CPMN) [http://www.serc.kyushu-u.ac.jp/index_e.html], (2) the International Real-time Magnetic Observatory Network (INTERMAGNET) [http://www.intermagnet.org] and (3) the World Data Center for Geomagnetism, Kyoto (WDC) [http://wdc.kugi.kyoto-u.ac.jp/index.html]. Geomagnetic data obtained from more than 100 stations all over the world were analyzed and ionospheric currents due to each solar flare were estimated. We discovered ionospheric currents flowing along the dusk and dawn terminators. These currents are considered as Hall currents arising from charge accumulation along terminators during solar flares.

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