Characteristics of a new type of SFE observed at CPMN dip-equator stations : SFE*

Details Characteristics of a new type of SFE observed at CPMN dip-equator stations : SFE* Characteristics of a new type of SFE observed at CPMN dip-equator stations : SFE*

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13a1668y&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM13A-1668

Physics

2409 Current Systems (2721), 2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2479 Solar Radiation And Cosmic Ray Effects

Scientific paper

Solar flares are sometimes accompanied by temporal geomagnetic disturbances in the sunlit hemisphere. These disturbances are known as "esolar flare effects"(SFEs). The arrival of flare-electromagnetic radiations at the earth causes the ionospheric conductivity to drastically increase. Therefore, variations of SFEs are regarded as a simple enhancement of pre-flare ionospheric currents. Many scientists have demonstrated that SFEs show similar variation as the Sq in terms of the direction and magnitude [e.g. McNish, 1937; Nagata, 1952]. In this paper, we willl present a new type of SFE (we call "SFE") observed at Circum-pan Pacific Magnetometer Network (CPMN) [Yumoto et al, 2001] stations, in which geomagnetic response to an X-class flare showed negative (not positive) variations in the H component at the Dip-equator stations around local noon. The fact that these events occurred during the time period when the value of the local geomagnetic field was sufficiently above the night-time level suggests totally eastward-ionospheric current, while negative- direction changes (disturbances) of SFE* (H component) strongly suggests the enhancement of westward ionospheric currents. SFE*s may be reflected in complex height structure of the equatorial ionospheric current system. Thus an analysis of the SFE* events will result in an important contribution to the understanding of true picture of ionospheric current system.

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