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Relationship between solar energetic oxygen flux and MHD shock Mach number

Liou, K. and Wu, C.-C. and Dryer, M. and Wu, S. T. and Berdichevsky, D. B. and Plunkett, S. and Mewaldt, R. A. and Mason, G. M. (2012) Relationship between solar energetic oxygen flux and MHD shock Mach number. In: Physics of the Heliosphere: A 10 Year Retrospective. AIP Conference Proceedings. No.1436. American Institute of Physics , Melville, NY, pp. 253-258.

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This study correlates the time-intensity profile of a magnetohydrodynamic (MHD) shock with the corresponding solar energetic oxygen for a coronal mass ejection (CME) event that occurred on October 28, 2003. The intensity of MHD shock, in terms of Mach number, is simulated using a 1.5D MHD code, whereas the solar energetic oxygen flux is observed by the Solar Isotope Spectrometer (SIS) on board the Advanced Composition Explorer (ACE) spacecraft. A good correlation (Pearson correlation coefficient: r = 0.70 – 0.84) is found between the forward fast-mode shock Mach number and the hourly-averaged, logarithmic oxygen differential energy flux for 7 energy channels (7.3 – 63.8 MeV). We suspect that the intensity-time profile of high energy SEP events is manifested by the strength (Mach number) of CME-driven propagation shocks. While further studies with more events are required to be more conclusive, this study result provides a direction for future studies or predictions of SEP fluxes.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Mewaldt, R. A.0000-0003-2178-9111
Mason, G. M.0000-0003-2169-9618
Additional Information:© 2012 American Institute of Physics. Published online 21 May 2012. We acknowledge the use of ACE/SIS data, E. Stone is the principal investigator of the instrument, and the flare data from the NOAA Space Weather Prediction Center. We acknowledge support from NASA under contact NNN06AA01C (Task NNN10AA08T). The work of C.-C. Wu and S. Plunkett was supported by NRL ISES program. The work of S.-T Wu was supported by AFOSR Grant FA9550-07-1-0468 and NSF Grant ATM0754278 to UAH. The work of R. Mewaldt was supported by NASA Grant NNX08AI11G. The work of G. M. Mason was supported by NASA grants NNX10AT75G and NNX07AP69G.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Naval Research LaboratoryUNSPECIFIED
Air Force Office of Scientific Research (AFOSR)FA9550-07-1-0468
Subject Keywords:Solar energetic particles, CME-driven shock, MHD simulation, ACE
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2012-18
Series Name:AIP Conference Proceedings
Issue or Number:1436
Classification Code:PACS: 95
Record Number:CaltechAUTHORS:20160420-150455239
Persistent URL:
Official Citation:Relationship between solar energetic oxygen flux and MHD shock mach number K. Liou, C. -C. Wu, M. Dryer, S. T. Wu, D. B. Berdichevsky, S. Plunkett, R. A. Mewaldt and G. M. Mason Source: AIP Conf. Proc. 1436, 253 (2012);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66335
Deposited By: Ruth Sustaita
Deposited On:20 Apr 2016 22:54
Last Modified:22 Nov 2019 09:58

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