Naslov
Effects of Coronal holes on the Earth directed CMEs

Autori
Karuppiah, Suresh ; Dumbovic, Mateja

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

Skup
44th COSPAR Scientific Assembly

Mjesto i datum
Atena, Grcka, 16.07.2022. - 24.07.2022

Vrsta sudjelovanja
Predavanje

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 analyze 82 Earth-directed CMEs from 2011 to 2021 with interplanetary counterparts. In addition to the coronagraphic observations by LASCO onboard SOHO and SECCHI/COR onboard STEREO, 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. Out of 82 events we could identify 60 events with a clear location of the eruption on the solar disc, whereas for the remaining 22 events we could not identify their source region. For each CME with identified source region, we check whether or not there is a coronal hole present at the distance <50 degrees and perform a 3D reconstruction of the CMEs using the Graduated cylindrical shell (GCS) model. Finally, we analyze the CME transit times to Earth and their in situ signatures to determine if it was a nose/flank hit.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA