Correlation between the Sharp Variation of the Transport Rate of Magnetic Helicity and Solar Eruptive Events

Details Correlation between the Sharp Variation of the Transport Rate of Magnetic Helicity and Solar Eruptive Events Correlation between the Sharp Variation of the Transport Rate of Magnetic Helicity and Solar Eruptive Events

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...682l.133z&link_type=abstract

The Astrophysical Journal, Volume 682, Issue 2, pp. L133-L136.

Astronomy and Astrophysics

Astronomy

13

Sun: Activity, Sun: Flares, Sun: Magnetic Fields

Scientific paper

In this Letter we report a close relationship between the variations of the transport rate of magnetic helicity (dH/dt) and a microwave burst. The latter may be regarded as a prompt signal of nonthermal energetic particles originating from the magnetic reconnection during solar flaring events. We analyze the observations of magnetograms of MDI/SOHO and SOT/Hinode and the high-cadence microwave observation at 2.84 GHz obtained by the Chinese Solar Broadband Radiospectrometer (SBRS/Huairou) of a flare/CME event that occurred in NOAA Active Region 10930 on 2006 December 13. We find that there is a sharp jump of dH/dt around the onset and quench of a microwave burst at a frequency of 2.84 GHz: the rate of dH/dt changes from negative to positive around the start of the eruption and recovers to negative when the eruption stopped. Furthermore, the temporal profile of dH/dt is consistent with that of a microwave burst. These results indicate that sharp variations of dH/dt are closely related to the solar eruption.

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