Relationship between solar energetic oxygen flux and MHD shock Mach number
Abstract
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.
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.Attached Files
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Additional details
- Eprint ID
- 66335
- Resolver ID
- CaltechAUTHORS:20160420-150455239
- NASA
- NNN06AA01C
- NASA
- NNN10AA08T
- Naval Research Laboratory
- Air Force Office of Scientific Research (AFOSR)
- FA9550-07-1-0468
- NSF
- ATM0754278
- NASA
- NNX08AI11G
- NASA
- NNX10AT75G
- NASA
- NNX07AP69G
- Created
-
2016-04-20Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory
- Series Name
- AIP Conference Proceedings
- Series Volume or Issue Number
- 1436
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 2012-18