Naslov
Deflection/Rotation of Earth directed CMEs in the vicinity of Coronal Hole

Autori
Suresh Karuppiah, Mateja Dumbovic, Karmen Martinic

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
European Space Weather Week 2022

Mjesto i datum
Zagreb, Hrvatska, 24.10.2022. - 29.10.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Sun, Heliosphere, coronal mass ejection, coronal holes

Sažetak
Coronal mass ejections (CMEs) are the major eruptive phenomena in the solar atmosphere. They cause various space weather effects and may cause severe geomagnetic storms when their arrival at Earth is accompanied by a special magnetic configuration. CMEs can be deflected by coronal holes away or towards the Sun-Earth line depending on their relative location. In addition, high speed streams originating from coronal holes can influence CME propagation. We aim to analyze CME evolution in the vicinity of coronal hole to better understand these effects. We present the investigation of 61 Earth- directed CMEs from 2008 to 2020 based on the Richardson-Cane catalogue. We use the Atmospheric Imaging Assembly (AIA) images of wavelength 193Å and 304Å onboard Solar Dynamic Observatory (SDO) to check the signatures of associated solar flares, filament eruptions and coronal holes. In addition, we use white light data of coronagraphic observations by LASCO onboard SOHO and SECCHI/COR onboard STEREO. For all 60 events, we identify clear location of the eruption on the solar disc and also we check whether or not there is a coronal hole present at the distance <50 degrees. We analyze the deflection/rotation of CMEs by tracking them in COR1 and COR2 field of view of STEREO onboard SECCHI with the help of 3D reconstruction Graduated cylindrical shell (GCS) model. Also, we use CATCH tool to study the nearby coronal hole parameters. Our aim is to study how a coronal hole causes deflection/rotation of CMEs in the corona and also to study how some Earth-directed events miss the Spacecraft at L1 or observed as ejecta.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA