Ref: CTALK-2023-0058

The magnetic drivers of EUI campfires seen by SO/ PHI

Kahil, F. ; Chitta, L. P. ; Peter, H. ; Auchère, F. ; Solanki, S. K. ; ManyOtherAuthors, X. ; Berghmans, D ; PHIteam, X. ; EUI team, X.

Invited talk presented at Solar Orbiter 8, Belfast (UK) on 2022-09-13

Abstract: Campfires are the smallest ever detected localised brightenings in the quiet-Sun, observed by the High Resolution Imager (EUI/HRI) of the Extreme Ultraviolet Imager (EUI) at 17.4 nm on-board the Solar Orbiter (SO) spacecraft. The photospheric magnetic field configuration and its evolution, underlying campfires, are key to understanding the drivers of these heating events. The Polarimetric and Helioseismic Imager (SO/PHI) on- board SO offers a unique opportunity to provide co-observations at a spatial resolution similar to EUI (1 arcsecond). To this end, we employed magnetograms recorded by the High Resolution Telescope of PHI (PHI/HRT, 617.3 nm) to study the magnetic field below the EUI campfires observed during the cruise-phase of SO in February 2021. During this period, both instruments achieved a spatial resolution of 380 km on the Sun. We observed signatures of magnetic flux cancellation in the vicinity of most of the heating events, indicating that magnetic reconnection in the lower atmosphere could be their main driver. However, the PHI/HRT timeseries were not ideal in terms of cadence and overlap with the EUI/HRI observations to confirm this scenario. This unique study is revisited, now with the data acquired by both instruments during the first and second Remote Sensing Windows (RSWs) of SO's nominal phase in two observational campaigns on March 8th and 17th, 2022. At orbital distances of 0.489 AU and 0.379 AU from the Sun, both instruments achieved a spatial resolution of 360 km and 280 km, respectively. These novel data offer new insights into the photospheric counterpart of EUI campfires and consequently, improve our understanding of the underlying magnetic processes driving these events.

Keyword(s): Solar Orbiter ; EUI
Links: link

The record appears in these collections:
Conference Contributions & Seminars > Conference Talks > Invited Talks
Royal Observatory of Belgium > Solar Physics & Space Weather (SIDC)
Solar-Terrestrial Centre of Excellence

 Record created 2023-02-01, last modified 2023-02-01