Study of plasma heating processes in a coronal mass ejection-driven shock sheath region observed with the Metis coronagraph

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00584793" target="_blank" >RIV/67985815:_____/24:00584793 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0353185" target="_blank" >https://hdl.handle.net/11104/0353185</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/ad26fb" target="_blank" >10.3847/1538-4357/ad26fb</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Study of plasma heating processes in a coronal mass ejection-driven shock sheath region observed with the Metis coronagraph

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Study of plasma heating processes in a coronal mass ejection-driven shock sheath region observed with the Metis coronagraph

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

1538-4357

Svazek periodika

964

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

15

Kód UT WoS článku

001183677700001

EID výsledku v databázi Scopus

2-s2.0-85187568866