Naslov
Multi-spacecraft observations of ICMEs propagating beyond Earth orbit during MSL/RAD flight and surface phases

Autori
Johan Lauritz Freiherr von Forstner ; Jingnan Guo ; Robert F Wimmer- Schweingruber ; Don Hassler ; Manuela Temmer ; Bojan Vršnak ; Jaša Čalogović ; Mateja Dumbović ; Henning Lohf ; Jan Kristoffer Appel ; Bernd Heber ; Christian T Steigies ; Cary Zeitlin ; Bent Ehresmann ; Lan K. Jian ; Eckart Boehm ; Stephan I Boettcher ; Soenke Burmeister ; Cesar Martin-Garcia ; David E Brinza ; Arik Posner ; Gunther Reitz ; Daniel Matthiae ; Scot CR Rafkin ; Gerald weigle II ; Francis Cucinotta

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

Skup
AGU Fall Meeting

Mjesto i datum
New Orleans (LA), Sjedinjene Američke Države, 11.12.2017. - 15.12.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
CMEs, Forbush decrease, multi-point observation

Sažetak
The propagation of interplanetary coronal mass ejections (ICMEs) between Earth's orbit (1 AU) and Mars (~ 1.5 AU) has been studied with their propagation speed estimated from both measurements and simulations. The enhancement of the magnetic fields related to ICMEs and their shock fronts cause so-called Forbush decreases, which can be detected as a reduction of galactic cosmic rays measured on-ground or on a spacecraft. We have used galactic cosmic ray (GCR) data from in-situ measurements at Earth, from both STEREO A and B as well as the GCR measurement by the Radiation Assessment Detector (RAD) instrument onboard Mars Science Laboratory (MSL) on the surface of Mars as well as during its flight to Mars in 2011-2012. A set of ICME events has been selected during the periods when Earth (or STEREO A or B) and MSL locations were nearly aligned on the same side of the Sun in the ecliptic plane (so- called opposition phase). Such lineups allow us to estimate the ICMEs' transit times between 1 AU and the MSL location by estimating the delay time of the corresponding Forbush decreases measured at each location. We investigate the evolution of their propagation speeds after passing Earth's orbit and find that the deceleration of ICMEs due to their interaction with the ambient solar wind continues beyond 1 AU. The results are compared to simulation data obtained from two CME propagation models, namely the Drag- Based Model (DBM) and the WSA-ENLIL plus cone model.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA