Multipoint Study of Successive Coronal Mass Ejections Driving Moderate Disturbances at 1 au

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Palmerio , E , Scolini , C , Barnes , D , Magdalenic , J , West , M J , Zhukov , A N , Rodriguez , L , Mierla , M , Good , S W , Morosan , D E , Kilpua , E K J , Pomoell , J & Poedts , S 2019 , ' Multipoint Study of Successive Coronal Mass Ejections Driving Moderate Disturbances at 1 au ' , Astrophysical Journal , vol. 878 , no. 1 , 37 . https://doi.org/10.3847/1538-4357/ab1850

Title: Multipoint Study of Successive Coronal Mass Ejections Driving Moderate Disturbances at 1 au
Author: Palmerio, Erika; Scolini, Camilla; Barnes, David; Magdalenic, Jasmina; West, Matthew J.; Zhukov, Andrei N.; Rodriguez, Luciano; Mierla, Marilena; Good, Simon W.; Morosan, Diana E.; Kilpua, Emilia K. J.; Pomoell, Jens; Poedts, Stefaan
Other contributor: University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Space Physics Research Group
University of Helsinki, Space Physics Research Group
University of Helsinki, Particle Physics and Astrophysics


Date: 2019-06-10
Language: eng
Number of pages: 15
Belongs to series: Astrophysical Journal
ISSN: 0004-637X
DOI: https://doi.org/10.3847/1538-4357/ab1850
URI: http://hdl.handle.net/10138/303512
Abstract: We analyze in this work the propagation and geoeffectiveness of four successive coronal mass ejections (CMEs) that erupted from the Sun during 2013 May 21-23 and were detected in interplanetary space by the Wind and/or STEREO-A spacecraft. All these CMEs featured critical aspects for understanding so-called "problem space weather storms" at Earth. In the first three events a limb CMEs resulted in moderately geoeffective in situ structures at their target location in terms of the disturbance storm time (Dst) index (either measured or estimated). The fourth CME, which also caused a moderate geomagnetic response, erupted from close to the disk center as seen from Earth, but it was not visible in coronagraph images from the spacecraft along the Sun-Earth line and appeared narrow and faint from off-angle viewpoints. Making the correct connection between CMEs at the Sun and their in situ counterparts is often difficult for problem storms. We investigate these four CMEs using multiwavelength and multipoint remote-sensing observations (extreme ultraviolet, white light, and radio), aided by 3D heliospheric modeling, in order to follow their propagation in the corona and in interplanetary space and to assess their impact at 1 au. Finally, we emphasize the difficulties in forecasting moderate space weather effects that are provoked by problematic and ambiguous events and the importance of multispacecraft data for observing and modeling problem storms.
Subject: solar-terrestrial relations
solar wind
Sun: coronal mass ejections (CMEs)
SOLAR-WIND
FLUX-ROPE
IN-SITU
INTERPLANETARY PROPAGATION
MAGNETOSPHERIC STORMS
MAGNETIC CLOUDS
ORIGIN
RADIO
SHOCK
MISSION
115 Astronomy, Space science
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