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SUMMARY:Active region evolution – Tracking active regions from the near-
 Earth side to the solar far side (and back)
DTSTART;VALUE=DATE-TIME:20230509T125500Z
DTEND;VALUE=DATE-TIME:20230509T131000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115653Z
UID:indico-contribution-313@meetings.aip.de
DESCRIPTION:Speakers: Hanna Strecker (Instituto de Astrofísica de Andaluc
 ía ((IAA-CSIC) & Spanish Space Solar Physics Consortium)\nFor a long time
 \, the study of the evolution of active regions in the solar photosphere h
 as been limited by the transit time of the active regions over the solar d
 isk as seen from Earth. Since its launch in February 2020\, ESA/NASA's Sol
 ar Orbiter spacecraft provides us\, from time to time\, with the possibili
 ty to see the solar far side. The Polarimetric and Helioseismic Imager (SO
 /PHI)\, one of its ten instruments\, delivers data of the solar photospher
 e in intensity and vector magnetic field. In February 2021\, during Solar 
 Orbiter’s first superior conjunction\, the full disk telescope of SO/PHI
  acquired the first polarimetric data of the photospheric solar far side. 
 We combine this data with data from the Helioseismic and Magnetic Imager (
 HMI) flying on board NASA’s Solar Dynamic Observatory. This enables an a
 lmost 360º view of the Sun and allows\, for the first time\, the tracking
  of active regions over a full solar rotation almost without interruption\
 , from the near-Earth side to the far side. We study the evolution of four
  active regions in intensity and LOS magnetograms while they rotate from t
 he near-Earth side\, seen by HMI\, to the solar far side\, into the field-
 of-view (FOV) seen by SO/PHI. Three of the active regions decay on the sol
 ar far side and do not show any signal in intensity when reaching the FOV 
 of SO/PHI. One active region crosses the disk as seen from Earth while app
 earing to decay. However\, new flux emerges on the solar far side leading 
 to the development of pores and a small sunspot before the region reaches 
 the limb as seen in SO/PHI and reappears on the near-Earth side. We will p
 resent the longest almost uninterrupted study of the evolution of the magn
 etic field of active regions\, achieved so far. This demonstrates the uniq
 ueness of combining Solar Orbiter and near-Earth side observations to cont
 inuously study the evolution of active regions from their emergence to the
 ir decay.\n\nhttps://meetings.aip.de/event/24/contributions/313/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/24/contributions/313/
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