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SUMMARY:Magnetic field changes in the photosphere during solar flares and 
 their association with flare ribbons
DTSTART;VALUE=DATE-TIME:20230509T155500Z
DTEND;VALUE=DATE-TIME:20230509T161000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115654Z
UID:indico-contribution-315@meetings.aip.de
DESCRIPTION:Speakers: Rahul Yadav (University of Colorado\, Boulder)\nAbru
 pt and permanent photospheric magnetic field changes have been observed in
  many flares. It is believed that such changes are related to the reconfig
 uration of magnetic field lines\, however\, the real origin is still uncle
 ar. I will present the analysis of 37 flares observed by the Solar Dynamic
 s Observatory (SDO). The characteristics of the magnetic field changes in 
 the flare events are determined using HMI high-cadence vector magnetogram 
 (135 s)\, whereas the ribbon properties are derived from co-aligned AIA 16
 00 Å images. We find that pixels swept up by ribbons do not always exhibi
 t permanent changes in the field. However\, when they do\, ribbon emission
  typically occurs several minutes before the start of field changes. The c
 hanges in the properties of the field show no relation to the size of acti
 ve regions but are strongly related to the flare-ribbon properties. We fin
 d that the duration of permanent changes in the field is strongly coupled 
 with the duration of the flare. Our results suggest that changes in photos
 pheric magnetic fields are caused by a combination of two scenarios: contr
 action of flare loops driven by magnetic reconnection and coronal implosio
 n.\n\nhttps://meetings.aip.de/event/24/contributions/315/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/24/contributions/315/
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