Production of flare accelerated particles at the sun

2008 ◽  
pp. 219-239 ◽  
Author(s):  
Gérard Trottet ◽  
Nicole Vilmer
Keyword(s):  
The Sun ◽  
Accelerated Particles

scholarly journals QUASI-PERIODIC PULSATIONS IN SOLAR AND STELLAR FLARES. REVIEW

2020 ◽  
Vol 6 (1) ◽  
pp. 3-29
Author(s):  
Elena Kupriyanova ◽  
Dmitrii Kolotkov ◽  
Valery Nakariakov ◽  
Anastasiia Kaufman
Keyword(s):  
State Of The Art ◽  
The Sun ◽  
Periodic Modulation ◽  
Stellar Flares ◽  
Open Questions ◽  
Magnetic Spectrum ◽  
Similarities And Differences ◽  
Electro Magnetic ◽  
Accelerated Particles ◽  
Oscillatory Processes

This paper provides an overview of the state-of-the-art studies of oscillatory processes in solar and stellar flares, based on modern observational data from ground-based and space-borne instruments with high temporal, spatial, and spectral resolution in different electro-magnetic spectrum ranges. We examine the mechanisms that generate flare emission and its quasi-periodic modulation. We discuss similarities and differences between solar and stellar flares, and address associated problems of superflares on the Sun and space weather problems. Quasi-periodic pulsations (QPPs) of flare radiation are shown to be an effective tool for diagnosing both the flare processes themselves and the parameters of flare plasma and accelerated particles. We consider types of QPPs, their statistical properties, and methods of analysis, taking into account the non-stationarity of the QPPs’ parameters. We review the proposed mechanisms of QPPs and address open questions.

Gamma Radiation From Flare-Accelerated Particles Impacting the Sun

2006 ◽  
Author(s):  
Gerald H. Share ◽  
Ronald J. Murphy
Keyword(s):  
Gamma Radiation ◽  
The Sun ◽  
Accelerated Particles

scholarly journals Coronal and Heliospheric Observations of Solar Particle Events

1996 ◽  
Vol 154 ◽  
pp. 179-186
Author(s):  
Monique Pick
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Interplanetary Medium ◽  
Solar Wind Plasma ◽  
Low Energy ◽  
The Sun ◽  
Particle Beams ◽  
Solar Particle Events ◽  
Magnetic Structures ◽  
Accelerated Particles

AbstractObservations of accelerated particle beams are used to probe the coronal and interplanetary magnetic field structures over large distances from the Sun on the order of a few AU and for various heliolatitudes. It is shown that the propagation of low energy particles is very much controled by discrete interplanetary magnetic field structures. These discrete magnetic structures are sometimes embedded within interplanetary solar wind plasma disturbances, commonly called CMEs. The connection between the corona and the interplanetary medium is discussed. These observations lead to new insights on the origin of accelerated particles detected in association with CMEs.

Measurement of accelerated particles at the Sun

2000 ◽  
Author(s):  
Gerald H. Share
Keyword(s):  
The Sun ◽  
Accelerated Particles

scholarly journals QUASI-PERIODIC PULSATIONS IN SOLAR AND STELLAR FLARES. REVIEW

2020 ◽  
Vol 6 (1) ◽  
pp. 3-23 ◽  
Author(s):  
Elena Kupriyanova ◽  
Dmitrii Kolotkov ◽  
Valery Nakariakov ◽  
Anastasiia Kaufman
Keyword(s):  
Spectral Resolution ◽  
State Of The Art ◽  
Electromagnetic Spectrum ◽  
The Sun ◽  
Periodic Modulation ◽  
Stellar Flares ◽  
Open Questions ◽  
Similarities And Differences ◽  
Accelerated Particles ◽  
Oscillatory Processes

This paper provides an overview of the state-of-the-art studies of oscillatory processes in solar and stellar flares, based on modern observational data from ground-based and space-borne instruments with high temporal, spatial, and spectral resolution in different bands of the electromagnetic spectrum. We examine the mecha-nisms that generate flare emission and its quasi-periodic modulation. We discuss similarities and differences be-tween solar and stellar flares, and address associated problems of superflares on the Sun and space weather. Quasi-periodic pulsations (QPPs) of flare emission are shown to be an effective tool for diagnosing both the flare processes themselves and the parameters of flaring plasmas and accelerated particles. We consider types of QPPs, their statistical properties, and methods of analysis, taking into account the non-stationarity of the QPPs’ parameters. We review the proposed mechanisms of QPPs and summarize open questions.

scholarly journals Directionality of Flare-accelerated -Particles at the Sun

2003 ◽  
Vol 595 (2) ◽  
pp. L89-L92 ◽  
Author(s):  
Gerald H. Share ◽  
Ronald J. Murphy ◽  
David M. Smith ◽  
Robert P. Lin ◽  
Brian R. Dennis ◽  
...  
Keyword(s):  
The Sun ◽  
Accelerated Particles

scholarly journals Re-examining the correlation of complex solar type III radio bursts and solar energetic particles

2008 ◽  
Vol 4 (S257) ◽  
pp. 335-340 ◽  
Author(s):  
R. J. MacDowall ◽  
I. G. Richardson ◽  
R. A. Hess ◽  
G. Thejappa
Keyword(s):  
Wind Waves ◽  
Solar Proton ◽  
Data Sets ◽  
The Sun ◽  
Radio Bursts ◽  
Normal Type ◽  
Type Iii ◽  
Solar Type ◽  
Accelerated Particles ◽  
Event Occurrence

AbstractInterplanetary radio observations provide important information on particle acceleration processes at the Sun and propagation of the accelerated particles in the solar wind. Cane et al. (2002) have drawn attention to a class of prominent radio bursts that accompany >20 MeV solar proton events. They call these bursts ‘type III-L’ because: they are fast drifting (like normal type III bursts associated with electrons accelerated at impulsive solar flares); they are Long-lasting compared to normal type III bursts; they occur Late compared to the onset of the related solar event; and, they commence at Lower frequencies (~100 MHz) than normal type III bursts, suggesting that they originate higher in the corona at ~0.5 Rs above the Sun. We report on an analysis of the correlated radio and SEP events during 1996-2006 using the Wind Waves and near-Earth SEP data sets, and discuss whether the characteristics of the complex type III bursts (at less than 14 MHz) will permit them to serve as proxies for SEP event occurrence and intensity.

Chromospheric activity as a function of age in main-sequence stars

1966 ◽  
Vol 24 ◽  
pp. 40-43
Author(s):  
O. C. Wilson ◽  
A. Skumanich
Keyword(s):  
Main Sequence ◽  
The Sun ◽  
Main Sequence Stars ◽  
Tentative Conclusion ◽  
Chromospheric Activity ◽  
General Field ◽  
Large Clusters

Evidence previously presented by one of the authors (1) suggests strongly that chromospheric activity decreases with age in main sequence stars. This tentative conclusion rests principally upon a comparison of the members of large clusters (Hyades, Praesepe, Pleiades) with non-cluster objects in the general field, including the Sun. It is at least conceivable, however, that cluster and non-cluster stars might differ in some fundamental fashion which could influence the degree of chromospheric activity, and that the observed differences in chromospheric activity would then be attributable to the circumstances of stellar origin rather than to age.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

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