The ``Same Side - Opposite Side Effect'' of the Heliospheric Current Sheet in Ionospheric Negative Storms

Details The ``Same Side - Opposite Side Effect'' of the Heliospheric Current Sheet in Ionospheric Negative Storms The ``Same Side - Opposite Side Effect'' of the Heliospheric Current Sheet in Ionospheric Negative Storms

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010soph..263..263l&link_type=abstract

Solar Physics, Volume 263, Issue 1-2, pp. 263-273

Physics

Cme-Interplanetary Shock (Cme-Ips) Events, Heliospheric Current Sheet (Hcs), Ionospheric Storms

Scientific paper

Using 141 CME-interplanetary shock (CME-IPS) events and foF2 from eight ionosonde stations from January 2000 to September 2005, from the statistical results we find that there is a “same side - opposite side effect” in ionospheric negative storms, i.e., a large portion of ionospheric negative disturbances are induced by the same-side events (referring to the CMEs whose source located on the same side of the heliospheric current sheet (HCS) as the Earth), while only a small portion is associated with the opposite-side events (the CMEs source located on the opposite side of the HCS as the Earth); the ratio is 128 vs. 46, and it reaches 41 vs. 14 for the intense ionospheric negative storms. In addition, the ionospheric negative storms associated with the same-side events are often more intense. A comparison of the same-side event (4 April 2000) and the opposite-side event (2 April 2001) shows that the intensity of the ionospheric negative storm caused by the same-side event is higher than that by the opposite-side event, although their initial conditions are quite similar. Our preliminary results show that the HCS has an “impeding” effect to CME-IPS, which results in a shortage of energy injection in the auroral zone and restraining the development of ionospheric negative perturbations.

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