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VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260523T125359Z
UID:https://www.mps.mpg.de/events/44841/7840847
DTSTART:20260226T100000Z
DTEND:20260226T110000Z
CLASS:PUBLIC
CREATED:20260218T175842Z
DESCRIPTION:Understanding how magnetic properties of solar active regions i
 nfluence coronal mass ejection (CME) dynamics is essential for constrainin
 g eruption models and improving space-weather prediction. In this work\, w
 e investigate the relationship between magnetic field diagnostics derived 
 from potential-field extrapolations and the 3D speeds of CMEs.We focus on 
 physically motivated parameters associated with eruption onset\, including
  the critical height of torus instability (hcrit)\, the strength of the ov
 erlying magnetic field strength (Bt)\, and the flare ribbon flux (Rf). Whi
 le hcrit and Bt are traditionally evaluated directly above polarity invers
 ion lines (PILs)\, \; however\, identifying PILs can involve threshold-dep
 endent and partially manual selection procedures. To reduce this dependenc
 y\, we test whether these diagnostics retain predictive power when compute
 d over broader regions of interest (ROIs) within the active region\, witho
 ut relying on explicit PIL selection.Using decay index profiles derived fr
 om photospheric magnetograms\, we find a strong correlation between hcrit 
 and CME speed (r ≈ 0.71). When evaluated over progressively larger ROIs 
 centered on the PIL\, weighted hcrit from the largest region considered pr
 ovides the strongest correlation (r ≈ 0.73)\, indicating that the broade
 r active-region field structure is as informative as measurements strictly
  above the PIL. In contrast\, Bt shows weaker (r = 0.33) predictive capabi
 lity\, and combining it with hcrit offers only marginal improvement. Ribbo
 n flux exhibits moderate correlation (r = 0.44) with CME speed\, but the h
 ighest predictive power is consistently obtained when hcrit is included.Th
 ese results suggest that\, within potential-field models\, the critical he
 ight of torus instability is the dominant magnetic diagnostic of CME speed
 \, and that the large-scale magnetic environment of active regions plays a
  key role in regulating eruption dynamics.\nSpeaker: Harshita Gandhi
LAST-MODIFIED:20260218T180912Z
LOCATION:https://uio.zoom.us/j/63138938090
ORGANIZER;CN=Valeriia Liakh:mailto:
SUMMARY:ESPOS: ESPOS: Linking Magnetic Field Diagnostics with 3D Coronal Ma
 ss Ejection Speeds in Solar Active Regions (Harshita Gandhi)
URL;VALUE=URI:https://www.mps.mpg.de/events/44841/7840847
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