Naslov
CME-CME Interactions as Sources of CME Helio-effectiveness

Autori
Camilla Scolini ; Emmanuel Chané ; Manuela Temmer ; Jens Pomoell ; Emilia Kilpua ; Karin Dissauer ; Astrid Veronig ; Erika Palmerio ; Mateja Dumbovic ; Jingnan Guo ; Luciano Rodriguez ; Stefaan Poedts

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

Skup
European Space Weather Symposium

Mjesto i datum
Online, 02.11.2020. - 06.11.2020

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
coronal mass ejections, space weather

Sažetak
Coronal Mass Ejections (CMEs) are the main space weather drivers in the heliosphere. It is known that the capability of individual CMEs to drive strong disturbances at Earth (“geo-effectiveness”) and other locations (“helio-effectiveness”) primarily depends on their speed, density, and magnetic field at impact, and that CME-CME interactions can often dramatically amplify the geo-effectiveness of the individual CMEs involved. However, the actual quantification of this amplification has been rarely investigated, and previous studies have mostly focused on the near-Earth region, i.e. without considering its full space-time evolution as the CMEs propagate to 1 AU and beyond. Here, we present a study on the role of CME-CME interactions as sources of CME helio-effectiveness by performing numerical simulations with the EUHFORIA heliospheric model. As a case study, we consider a sequence of geo-effective CMEs observed in September 2017. We perform observation-based simulations of magnetised CMEs, and quantify the resulting helio-effectiveness amplification of individual CMEs as a function of the CME-CME interaction phase and of the location within the CME structure. We then explore the possibility of existence of a “helio-effectiveness amplification zone”, i.e. a characteristic heliocentric distance where CME-CME interactions have the highest probability to develop into highly helio-effective events.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA