BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Study of the evolution of magnetic energy and helicity injection i
 n an active region with recurring eruptive events
DTSTART;VALUE=DATE-TIME:20230509T081500Z
DTEND;VALUE=DATE-TIME:20230509T083000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115653Z
UID:indico-contribution-319@meetings.aip.de
DESCRIPTION:Speakers: Marcelo López Fuentes (Instituto de Astronomía y F
 ísica del Espacio (CONICET-UBA))\nSolar events such as flares and coronal
  mass ejections are the most energetic phenomena affecting interplanetary 
 space in timescales ranging from minutes to a few days. There has been\, i
 n recent years\, a strong interest in characterizing the processes that in
 ject magnetic energy and helicity in solar active regions (ARs) and the me
 chanisms that destabilize their magnetic structure leading to the energy r
 eleased during those events. We analyze the magnetic evolution of AR NOAA 
 11476 that produced a series of minifilament confined eruptions of the “
 surge” type accompanied by M-class flares. In a previous work\, we found
  that these events are associated to the presence of a small rotating bipo
 le that emerged in the middle of the globally bipolar AR magnetic configur
 ation. The bipole rotation preceded and concurred in time with the observe
 d ejections. Magnetic flux cancellation is also identified along the polar
 ity inversion line of the bipole where the minifilaments were recurrently 
 formed and ejected. Here we combine the analysis\, for the full AR and the
  rotating bipole\, of the evolution of a series of magnetic parameters com
 puted from SDO/HMI vector magnetograms with estimations of the magnetic en
 ergy and magnetic helicity injection obtained using the Differential Affin
 e Velocity Estimator for Vector Magnetograms (DAVE4VM) method. This proced
 ure is based on the determination\, from vector magnetograms\, of the affi
 ne velocity field constrained by the induction equation. Our results provi
 de a series of relations between the studied parameters that define proxie
 s of the magnetic evolution of the AR that\, eventually\, can be used as p
 ossible precursors of active events.\n\nhttps://meetings.aip.de/event/24/c
 ontributions/319/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/24/contributions/319/
END:VEVENT
END:VCALENDAR