Observational Evidence of New Current Sheets Following CMEs

Details Observational Evidence of New Current Sheets Following CMEs Observational Evidence of New Current Sheets Following CMEs

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh51c03w&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH51C-03

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2134 Interplanetary Magnetic Fields, 7513 Coronal Mass Ejections, 7524 Magnetic Fields

Scientific paper

Some degree of disconnection of the magnetic flux associated with CMEs appears to be required to prevent a continuous increase in the net interplanetary magnetic flux, which is not observed. Field line reconnection in the wake of CMEs is also a fundamental aspect of some magnetically driven eruptive flare/CME models, e.g., the "standard" CHSKP model. This model features a growing hot loop arcade beneath a rising X-type neutral point that is connected to the retreating CME by a current sheet. Some recent MHD models invoking reconnection in such a current sheet, e.g., Lin and Forbes (2000), make predictions of the height or length of the current sheet and the energy input as functions of time. In a previous study of SMM CMEs observed from 1984-1989 having candidate magnetic disconnection features, primarily transient concave-outward bright regions following the CME leading edge, we found that about half were followed by coaxial, bright, narrow rays suggestive of newly formed current sheets. The rays appeared relatively suddenly several hours after the CME leading edge had left the field of view. We present the results of analysis of these structures, including their heights and lengths, brightness variations, and widths all as functions of time, and compare the results with CME/flux rope reconnection models which involve current sheets.

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