Energetic Particles Accelerated by Shocks in the Heliosphere: What is the Source Material?
Abstract
Theoretical studies of particle acceleration by shocks have successfully modeled many observed features of the particle energy spectra and temporal variations; however, spectral slopes do not agree with in situ observations, and intensities show huge variations not explained by the models. Recent observations have shown that trace ions in the solar wind, such as 3He and He+, are present in the accelerated particles with enhanced abundances. The average heavy ion composition is also found to differ significantly from the solar wind. It is observed that these features correlate significantly with ambient suprathermal material abundances, giving evidence that the suprathermals are the seed population that is actually energized. This raises important new questions such as why the suprathermals are favored over the much more abundant solar wind. Since the suprathermal ion population has many more contributors, and much larger variability than the solar wind, this population needs much more detailed study to allow a closure of theory and observations in interplanetary space.
- Authors:
-
- Department of Physics, Univ. of Maryland, College Park MD 20742 (United States)
- Aerospace Corp., El Segundo, CA 90245 (United States)
- Dept. Physics and Space Sci., Florida Inst. Tech., Melbourne, FL 32901 (United States)
- Publication Date:
- OSTI Identifier:
- 20719184
- Resource Type:
- Journal Article
- Journal Name:
- AIP Conference Proceedings
- Additional Journal Information:
- Journal Volume: 781; Journal Issue: 1; Conference: 4. annual IGPP international astrophysics conference, Palm Springs, CA (United States), 26 Feb - 3 Mar 2005; Other Information: DOI: 10.1063/1.2032700; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABUNDANCE; ACCELERATION; ENERGY SPECTRA; HEAVY IONS; HELIOSPHERE; HELIUM 3; HELIUM IONS; INTERPLANETARY SPACE; SHOCK WAVES; SOLAR PARTICLES; SOLAR WIND
Citation Formats
Mason, G M, I.P.S.T., Univ. of Maryland, College Park, MD 20742, Desai, M I, Mazur, J E, and Dwyer, J R. Energetic Particles Accelerated by Shocks in the Heliosphere: What is the Source Material?. United States: N. p., 2005.
Web. doi:10.1063/1.2032700.
Mason, G M, I.P.S.T., Univ. of Maryland, College Park, MD 20742, Desai, M I, Mazur, J E, & Dwyer, J R. Energetic Particles Accelerated by Shocks in the Heliosphere: What is the Source Material?. United States. https://doi.org/10.1063/1.2032700
Mason, G M, I.P.S.T., Univ. of Maryland, College Park, MD 20742, Desai, M I, Mazur, J E, and Dwyer, J R. 2005.
"Energetic Particles Accelerated by Shocks in the Heliosphere: What is the Source Material?". United States. https://doi.org/10.1063/1.2032700.
@article{osti_20719184,
title = {Energetic Particles Accelerated by Shocks in the Heliosphere: What is the Source Material?},
author = {Mason, G M and I.P.S.T., Univ. of Maryland, College Park, MD 20742 and Desai, M I and Mazur, J E and Dwyer, J R},
abstractNote = {Theoretical studies of particle acceleration by shocks have successfully modeled many observed features of the particle energy spectra and temporal variations; however, spectral slopes do not agree with in situ observations, and intensities show huge variations not explained by the models. Recent observations have shown that trace ions in the solar wind, such as 3He and He+, are present in the accelerated particles with enhanced abundances. The average heavy ion composition is also found to differ significantly from the solar wind. It is observed that these features correlate significantly with ambient suprathermal material abundances, giving evidence that the suprathermals are the seed population that is actually energized. This raises important new questions such as why the suprathermals are favored over the much more abundant solar wind. Since the suprathermal ion population has many more contributors, and much larger variability than the solar wind, this population needs much more detailed study to allow a closure of theory and observations in interplanetary space.},
doi = {10.1063/1.2032700},
url = {https://www.osti.gov/biblio/20719184},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 781,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2005},
month = {Mon Aug 01 00:00:00 EDT 2005}
}