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Energy and Mass Supply in the Decay Phase of Long Duration Solar Flare Events View all abstracts by submitter

Kiyoto Shibasaki   Submitted: 2002-01-29 19:38

A new mechanism is proposed to supply energy and mass in the decay phase of long duration solar flare events (LDEs). LDEs are known to be caused by filament eruptions and bright arcade structures continue for several hours or even a day. To overcome the short cooling time, continuous energy and mass supply is required. Continuous magnetic reconnection in the current sheet extended above the arcade as been proposed to supply energy and mass. However, no direct observations of the current sheet have been reported. The new mechanism that we are proposing is based on the recent observations of down flows onto the top of arcades along the vertical spiky features observed by {it Yohkoh} Soft X-ray Telescope. We interpret these down flows as free-falling plasma. Falling plasma from high altitude can convert its potential energy into thermal energy and heat itself with an average temperature of several million-degree Kelvin. Observations show that the down flows continue for several hours. Coronagraph observations by SOHO/LASCO also show many falling features after coronal mass ejections. We propose these falling plasmas as the cause of the energy and mass supply for LDE events in the long lasting decay phase instead of magnetic reconnection.

Authors: Kiyoto Shibasaki

Publication Status: ApJL(in press)
Last Modified: 2002-01-29 19:38
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