Are Homologous Flare-Coronal Mass Ejection Events Triggered by Moving Magnetic Features?

Details Are Homologous Flare-Coronal Mass Ejection Events Triggered by Moving Magnetic Features? Are Homologous Flare-Coronal Mass Ejection Events Triggered by Moving Magnetic Features?

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...566l.117z&link_type=abstract

The Astrophysical Journal, Volume 566, Issue 2, pp. L117-L120.

Astronomy and Astrophysics

Astronomy

26

Sun: Coronal Mass Ejections (Cmes), Sun: Flares, Sun: Magnetic Fields, Sun: Uv Radiation

Scientific paper

Coronal mass ejections (CMEs) often present destabilization and eruption of a global (or large-scale) magnetic structure in the solar atmosphere. Furthermore, the Earth-directed CMEs are the primary driver of the disastrous space weather. Here we report on five homologous CMEs. They initiated in the early phase of five homologous X-class flares seen in NOAA Active Region 9236 on 2000 November 24-26. The flares appeared between the main sunspot with positive magnetic field and the moat of the active region. We examined the magnetic evolution in the source active region for the first three of the five flare-CME events and found that the main magnetic changes are magnetic flux emergence in the form of moving magnetic features (MMFs) in the vicinity of the main positive magnetic field. There are three peaks in the flux (number) distribution of the emerging MMFs. If each peak corresponds to an X-class flare and associated halo CME, there is a time lag of 10 hr between flux emergence and flaring. The flux appearing in the form of MMFs is 1.1×1022 Mx, with a net flux of -2.1×1021 Mx. Around the main spot region, about 9.1×1021 Mx of flux disappeared in the 2 day interval. This is indicative that the repeated flare-CME activities are triggered by the continuous emergence of MMFs.

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