Počet záznamů: 1
Study of plasma heating processes in a coronal mass ejection-driven shock sheath region observed with the Metis coronagraph
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SYSNO ASEP 0584793 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Study of plasma heating processes in a coronal mass ejection-driven shock sheath region observed with the Metis coronagraph Tvůrce(i) Frassati, F. (IT)
Bemporad, A. (IT)
Mancuso, S. (IT)
Heinzel, Petr (ASU-R) RID, ORCIDCelkový počet autorů 27 Číslo článku 15 Zdroj.dok. Astrophysical Journal - ISSN 0004-637X
Roč. 964, č. 1 (2024)Poč.str. 11 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova II radio-bursts ; white-light ; physical parameters Obor OECD Astronomy (including astrophysics,space science) Způsob publikování Open access Institucionální podpora ASU-R - RVO:67985815 UT WOS 001183677700001 EID SCOPUS 85187568866 DOI https://doi.org/10.3847/1538-4357/ad26fb Anotace On 2021 September 28, a C1.6 class flare occurred in active region NOAA 12871, located approximately at 27 degrees S and 51 degrees W on the solar disk with respect to Earth's point of view. This event was followed by a partial halo coronal mass ejection (CME) that caused the deflection of preexisting coronal streamer structures, as observed in visible-light coronagraphic images. An associated type II radio burst was also detected by both space- and ground-based instruments, indicating the presence of a coronal shock propagating into interplanetary space. By using H i Ly alpha (121.6 nm) observations from the Metis coronagraph on board the Solar Orbiter mission, we demonstrate for the first time the capability of UV imaging to provide, via a Doppler dimming technique, an upper limit estimate of the evolution of the 2D proton kinetic temperature in the CME-driven shock sheath as it passes through the field of view of the instrument. Our results suggest that over the 22 minutes of observations, the shock propagated with a speed decreasing from about 740 +/- 110 km s-1 to 400 +/- 60 km s-1. At the same time, the postshock proton temperatures peaked at latitudes around the shock nose and decreased with time from about 6.8 +/- 1.01 MK to 3.1 +/- 0.47 MK. The application of the Rankine-Hugoniot jump conditions demonstrates that these temperatures are higher by a factor of about 2-5 than those expected from simple adiabatic compression, implying that significant shock heating is still going on at these distances. Pracoviště Astronomický ústav Kontakt Anežka Melichárková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2025 Elektronická adresa https://hdl.handle.net/11104/0353185
Počet záznamů: 1