Recent Progress in Understanding Energy Conversion and Particle Acceleration in the Solar Corona

Kliem, B.; MacKinnon, A. L.; Trottet, G.; Bastian, T. S.

doi:10.1007/3-540-36242-8_15

Cited by 5 publications

(3 citation statements)

References 132 publications

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“…Different scenarios of acceleration processes for electrons and ions have been discussed (see, e.g., Kliem et al, 2003). Among others, coronal waves, CME lateral expansion as well as CME-CME interaction are possible candidates.…”

Section: Successive Cmes and Solar Energetic Particle Eventsmentioning

confidence: 99%

The Interaction of Successive Coronal Mass Ejections: A Review

et al. 2017

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We present a review of the different aspects associated with the interaction of successive coronal mass ejections (CMEs) in the corona and inner heliosphere, focusing on the initiation of series of CMEs, their interaction in the heliosphere, the particle acceleration associated with successive CMEs, and the effect of compound events on Earth's magnetosphere. The two main mechanisms resulting in the eruption of series of CMEs are sympathetic eruptions, when one eruption triggers another, and homologous eruptions, when a series of similar eruptions originates from one active region. CME-CME interaction may also be associated with two unrelated eruptions. The interaction of successive CMEs has been observed remotely in coronagraphs (with the Large Angle and Spectrometric Coronagraph Experiment -LASCO-since the early 2000s) and heliospheric imagers (since the late 2000s), and inferred from in situ measurements, starting with early measurements in the 1970s. The interaction of two or more CMEs is associated with complex phenomena, including magnetic reconnection, momentum exchange, the propagation of a fast magnetosonic shock through a magnetic ejecta, and changes in the CME expansion. The presence of a preceding CME a few hours before a fast eruption has been found to be connected with higher fluxes of solar energetic particles (SEPs), while CME-CME interaction occurring in the corona is often associated with unusual radio bursts, indicating electron acceleration. Higher suprathermal population, enhanced turbulence and wave activity, stronger shocks, and shock-shock or shock-CME interaction have been proposed as potential physical mechanisms to explain the observed associated SEP events. When measured in situ, CME-CME interaction may be associated with relatively well organized multiple-magnetic cloud events, instances of shocks propagating through a previous magnetic ejecta or more complex ejecta, when the characteristics of the individual eruptions cannot be easily distinguished. CME-CME interaction is associated with some of the most intense recorded geomagnetic storms. The compression of a CME by another and the propagation of a shock inside a magnetic ejecta can lead to extreme values of the southward magnetic field component, sometimes associated with large values of the dynamic pressure. This can result in intense geomagnetic storms, but also trigger substorms and large earthward motions of the magnetopause, potentially associated with changes in the outer radiation belts. Future in situ measurements in the inner heliosphere by Solar Probe+ and Solar Orbiter may shed light on the evolution of CMEs as they interact, by providing opportunities for conjunction and evolutionary studies.

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Section: Successive Cmes and Solar Energetic Particle Eventsmentioning

confidence: 99%

The Interaction of Successive Coronal Mass Ejections: A Review

et al. 2017

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“…In this review, I will not elaborate on this multi-faceted subject and rather leave it to other reviews to come. In the meantime, the interested reader may wish to study the articles in the book by , in particular the one by Kliem et al (2003).…”

Section: The Acceleration Of Sepsmentioning

confidence: 99%

Space Weather: The Solar Perspective

Schwenn

2006

Living Rev. Solar Phys.

425

347

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The term space weather refers to conditions on the Sun and in the solar wind, magnetosphere, ionosphere, and thermosphere that can influence the performance and reliability of space-borne and ground-based technological systems and that can affect human life and health. Our modern hi-tech society has become increasingly vulnerable to disturbances from outside the Earth system, in particular to those initiated by explosive events on the Sun: Flares release flashes of radiation that can heat up the terrestrial atmosphere such that satellites are slowed down and drop into lower orbits, solar energetic particles accelerated to near-relativistic energies may endanger astronauts traveling through interplanetary space, and coronal mass ejections are gigantic clouds of ionized gas ejected into interplanetary space that after a few hours or days may hit the Earth and cause geomagnetic storms. In this review, I describe the several chains of actions originating in our parent star, the Sun, that affect Earth, with particular attention to the solar phenomena and the subsequent effects in interplanetary space.

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“…They appear in broad-band clusters lasting seconds to about a minute. Metric spikes at 250 -500 MHz are quite common near the starting frequency of metric Type III bursts and are thus linked with the acceleration of electron beams (Benz, 2003;Kliem et al, 2003). They are considered as the signatures of accelerated particles at a highly fragmented, primary energy-release site (Nindos and Aurass, 2007).…”

Section: Introductionmentioning

confidence: 98%

Radio Observations of the 20 January 2005 X-class Flare

Bouratzis¹,

Preka‐Papadema²,

Hillaris³

et al. 2010

Sol Phys

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We present a multi-frequency and multi-instrument study of the 20 January 2005 event. We focus mainly on the complex radio signatures and their association with the active phenomena taking place: flares, CMEs, particle acceleration, and magnetic restructuring. As a variety of energetic-particle accelerators and sources of radio bursts are present, in the flare -ejecta combination, we investigate their relative importance in the progress of this event. The dynamic spectra of ARTEMIS-IV -Wind/Waves -HiRAS, with 2000 MHz -20 kHz frequency coverage, were used to track the evolution of the event from the low corona to the interplanetary space; these were supplemented with SXR, HXR, and γ -ray recordings. The observations were compared with the expected radio signatures and energetic-particle populations envisaged by the Standard Flare -CME model and the recon-C. Bouratzis · P. Preka-Papadema · A. Hillaris ( ) · X. Moussas 344 C. Bouratzis et al. nection outflow termination shock model. A proper combination of these mechanisms seems to provide an adequate model for the interpretation of the observational data.

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Recent Progress in Understanding Energy Conversion and Particle Acceleration in the Solar Corona

Cited by 5 publications

References 132 publications

The Interaction of Successive Coronal Mass Ejections: A Review

The Interaction of Successive Coronal Mass Ejections: A Review

Space Weather: The Solar Perspective

Radio Observations of the 20 January 2005 X-class Flare

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