Statistical Study of ICMEs and Their Sheaths During Solar Cycle 23 (1996 – 2008)

Mitsakou, E.; Moussas, X.

doi:10.1007/978-1-4939-2038-9_30

Cited by 7 publications

(10 citation statements)

References 37 publications

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“…(see, e.g., Zurbuchen & Richardson, 2006;Richardson and Cane, 2010;Kilpua et. al, 2013;Mitsakou and Moussas, 2014;Paouris and Mavromichalaki, 2017;Kilpua et al, 2017 and references therein). In this study, we searched for any solar wind disturbance (SWD) in the in situ data within a ±30 hours period around the estimated ICME arrival time, i.e., we looked for deviations from the quiet solar wind conditions in the four basic solar wind parameters (magnetic field strength, flow speed, proton density and proton thermal speed).…”

Section: Methodsmentioning

confidence: 99%

Sun-to-Earth Observations and Characteristics of Isolated Earth-Impacting Interplanetary Coronal Mass Ejections During 2008 – 2014

Maričić¹,

Vršnak

Veronig

et al. 2020

Sol Phys

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A sample of isolated Earth-impacting interplanetary coronal mass ejections (ICMEs) that occurred in the period January 2008 to August 2014 is analysed in order to study in detail the ICME in situ signatures with respect to the type of filament eruption related to the corresponding CME. Observations from different vantage points provided by SOHO, STEREO-A and STEREO-B are used to determine for each CME under study whether it is Earth directed or not. For Earth-directed CMEs, a kinematical study was performed using the STEREO-A,B COR1 and COR2 coronagraphs and the Heliospheric Imagers HI1, to estimate the CME arrival time at 1 AU and to link the CMEs with the corresponding in situ solar wind counterparts. Based on the extrapolated CME kinematics, we identified interacting CMEs, which were excluded from further analysis. Applying this approach, a set of 31 isolated Earth-impacting CMEs was unambiguously identified and related to the in situ measurements recorded by the Wind spacecraft. We classified the events into subsets with respect to the CME source location as well as with respect to the type of the associated filament eruption. Hence, the events are divided into three subsamples: active region (AR) CMEs, disappearing filament (DSF) CMEs, and stealthy CMEs. The related three groups of ICMEs were further divided into two subsets: magnetic obstacle (MO) events (out of which four were stealthy), covering ICMEs that at least partly expose characteristics of flux ropes, and ejecta (EJ) events, not showing such characteristics. In this way, 14 MO-ICMEs and 17 EJ-ICMES were identified. The solar source regions of the non-stealthy MO-ICMEs are found to be located predominantly (9/10; 90%) within ±30°from the solar central meridian, whereas EJ-ICMEs originate predominantly (16/17; 94%) from source regions that are outside ±30°. In the next step, MO-events were analysed in more detail, considering the magnetic field strengths and the plasma characteristics in three different segments of the ICMEs, defined as the turbulent sheath (TS), the frontal region (FR), and the MO itself. The analysis revealed various well-defined correlations for AR, DSF, and stealthy ICMEs, which we interpreted considering basic physical concepts. Our results support the hypothesis that ICMEs show different signatures depending on the in situ spacecraft trajectory, in terms of apex versus flank hits.

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Section: Methodsmentioning

confidence: 99%

Sun-to-Earth Observations and Characteristics of Isolated Earth-Impacting Interplanetary Coronal Mass Ejections During 2008 – 2014

Maričić¹,

Vršnak

Veronig

et al. 2020

Sol Phys

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“…Therefore, we chose to use some lists of events based exclusively on the observation of the solar wind parameters. Several of these lists are available, and we chose to use the lists from the studies of Mitsakou and Moussas () (for the ICMEs) and Jian et al () (for the CIRs). The list of ICMEs provides 325 events between 1996 and 2008 using the OMNI database.…”

Section: Methodsmentioning

confidence: 99%

“…The data are available on the CDAweb at http://cdaweb.gsfc.nasa.gov/. The lists of events come from the previous studies of Jian et al (), Mitsakou and Moussas (), and Kilpua et al (). Rémi Benacquista is thankful for funding from CNES and ONERA.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Variations of the Electron Fluxes in the Terrestrial Radiation Belts Due To the Impact of Corotating Interaction Regions and Interplanetary Coronal Mass Ejections

et al. 2018

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In this paper, we study the variations of the radiation belts electron fluxes induced by the interaction of two types of solar wind structures with the Earth magnetosphere: the corotating interaction regions and the interplanetary coronal mass ejections. We use a statistical method based on the comparison of the preevent and postevent fluxes. Applied to the National Oceanic and Atmospheric Administration‐Polar Operational Environmental Satellites data, this gives us the opportunity to extend previous studies focused on relativistic electrons at geosynchronous orbit. We enlighten how corotating interaction regions and Interplanetary Coronal Mass Ejections can impact differently the electron belts depending on the energy and the L shell. In addition, we provide a new insight concerning these variations by considering their amplitude. Finally, we show strong relations between the intensity of the magnetic storms related to the events and the variation of the flux. These relations concern both the capacity of the events to increase the flux and the deepness of these increases.

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“…As a consequence, dispersions may be important and have to be considered. In order to check if caught events correspond to real events, we have done a comparison with two lists of events, one of 279 CMEs (from July 1998 to December 2009) [see Mitsakou and Moussas , , ] and another of 443 Stream Interaction Regions (SIRs) (from July 1998 to December 2009) [see Jian et al , ]. 129 CMEs and 151 SIRs were caught by our criteria on

L_{normalm normalp}^{*}

.…”

Section: A Statistical Validation Using a Superposed Epoch Analysis Based On Noaa‐poes Data Setmentioning

confidence: 99%

Characterizing magnetopause shadowing effects in the outer electron radiation belt during geomagnetic storms

2016

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Relativistic electrons dynamics is still challenging to predict during the main phase of a storm. In particular, three dimensions radiation belt models, for which temporal resolution is limited, fail in predicting their behavior, especially when dropouts occur. In this paper we present a new model of magnetopause shadowing losses to be incorporated into the ONERA Salammbô code in order to improve the model accuracy. We show in this paper that above a few hundred keVs, magnetopause shadowing is the first contribution to losses in the outer electron belt during dropout events. Global variations of Earth‐magnetopause distance and relativistic electron flux have been analyzed to establish the correlation between the magnetopause shadowing and dropouts on the outer electron radiation belt during geomagnetic storms. To that purpose, a Superposed Epoch Analysis has been done using NOAA Polar‐orbiting Operational Environmental Satellite 15 measurements. First, a list of 67 Stream Interfaces has been used to validate the method, and then the Superposed Epoch Analysis has been run over more than one solar cycle. Our results show that the model of magnetopause location we have developed fits well with a Superposed Epoch Analysis performed and that we are able to define a criteria based on it that detect intense dropouts. Finally, we have included this model in the Salammbô code, and we present here the improvements obtained as well as the validation made.

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Statistical Study of ICMEs and Their Sheaths During Solar Cycle 23 (1996 – 2008)

Cited by 7 publications

References 37 publications

Sun-to-Earth Observations and Characteristics of Isolated Earth-Impacting Interplanetary Coronal Mass Ejections During 2008 – 2014

Sun-to-Earth Observations and Characteristics of Isolated Earth-Impacting Interplanetary Coronal Mass Ejections During 2008 – 2014

Variations of the Electron Fluxes in the Terrestrial Radiation Belts Due To the Impact of Corotating Interaction Regions and Interplanetary Coronal Mass Ejections

Characterizing magnetopause shadowing effects in the outer electron radiation belt during geomagnetic storms

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