Fast photospheric flows in a flaring active region

Details Fast photospheric flows in a flaring active region Fast photospheric flows in a flaring active region

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..505m&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

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Solar Active Regions, Solar Flares, Solar Photosphere

Scientific paper

We present new results from coordinated observations with THEMIS (multi-line spectropolarimetric mode) and MDI/SOHO obtained in Nov 2000. We observed active region AR 9236 using several photospheric lines before and after the last main flare produced by this very active region. Vector magnetic fields are computed from THEMIS data and a full inversion of the interesting profiles is performed. We observe fast flows which are probably supersonic in two regions located where this flare occurs. These flows seem to be long-lived structures (several hours). One of them is related to a strong shear with flows almost horizontal while the other is a downflow strongly inclined with respect to the vertical. They are present 9 hours before the flare, however their amplitude appears to be modified by the flare (especially during the first minutes).

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