000005694 001__ 5694
000005694 005__ 20221014153244.0
000005694 037__ $$aCTALK-2022-0038
000005694 100__ $$aPodladchikova, O.
000005694 245__ $$aEnergy Distribution of Campfires Observed During May 2020 Solar Orbiter Perihelion Campaign
000005694 260__ $$c2021
000005694 269__ $$c2021-09-07
000005694 500__ $$aPresented on Sept 9 2021 11:00
000005694 520__ $$aHigh resolution observations of the solar corona with the EUI telescope onboard the Solar Orbiter mission during the perihelion campaign at 0.56 AU revealed omnipresent impulsive quiet-un emissions in the 174 A filter, at previously unresolved temporal/spatial scales. Individual brightenings of the smallest linear size till 0.2Mm show temporal variability within tens of seconds. These EUV quiet sun brightenings, which have been nicknamed campfires, appear as individual quiet-Sun events or simultaneous / consecutive clusters situated along quiescent loops, where usually steadier emission is expected. The emission measure varies strongly almost in every pixel during the 260 sec observation time. The thermal energy content of individual impulses is calculated from observed emission enhancements and the derived temperature. EUV telescopes indicates heating events observable in coronal iron lines. The observed energy contents vary in the range 1021−1024 ergs, which is in agreement with the lower limit estimation of Parker’s nanoflare heating scenario. They occupy a thin vertical layer in the solar corona, as determined by triangulation. The observations suggest that the basic unit of impulsive energy release in EUV corona lies in the range of picoflares, 1021−1024 ergs, and may represent a significant part of the missing energy source for coronal heating. Observations were obtained during deep solar minimum, in the absence of any significant flaring activity and active regions.
000005694 594__ $$aSTCE
000005694 700__ $$aHarra, L.
000005694 700__ $$aBerghmans, D.
000005694 700__ $$aManyOtherAuthors, X.
000005694 700__ $$aZhukov, A.
000005694 700__ $$aVerbeeck, C.
000005694 700__ $$aDolla, L.
000005694 700__ $$aMierla, M.
000005694 700__ $$aKatsiyannis, T.
000005694 700__ $$aRodriguez, L.
000005694 700__ $$aKraaikamp, E.
000005694 700__ $$aStegen, K.
000005694 700__ $$aD'Huys, E.
000005694 773__ $$t16th European Solar Physics Meeting (online)
000005694 8560_ $$ffrancis.verbeeck@observatoire.be
000005694 85642 $$ahttps://indico.ict.inaf.it/event/794/contributions/9792/
000005694 8564_ $$s2122590$$uhttps://publi2-as.oma.be/record/5694/files/EUI_ENERGY_ESPM2021_L.pdf
000005694 8564_ $$s69137053$$uhttps://publi2-as.oma.be/record/5694/files/campfires_energy.ppt_CV.pptx
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000005694 906__ $$aContributed
000005694 980__ $$aCTALKCONT