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Using the Path Code for Modeling Gradual SEP Events in the Inner Heliosphere

Verkhoglyadova, O. P. and Li, G. and Zank, G. P. and Hu, Q. and Mewaldt, R. A. (2009) Using the Path Code for Modeling Gradual SEP Events in the Inner Heliosphere. Astrophysical Journal, 693 (1). pp. 894-900. ISSN 0004-637X. doi:10.1088/0004-637X/693/1/894.

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We model a gradual solar energetic particle (SEP) event that occurred on 2001 September 29, and was possibly caused by a coronal mass ejection related shock. A computer code PATH (particle acceleration and transport in the heliosphere) was tuned to simulate this event. The model includes local particle injection at an evolving quasi-parallel shock, first-order Fermi acceleration at the shock, and self-consistent excitation of MHD waves to enhance particle scattering, particle trapping, and escape from the shock complex, and transport in the inner heliosphere up to several AU. The shock and solar wind boundary conditions are derived from Advanced Composition Explorer (ACE) observations at 1 AU, which are then extrapolated to 0.1 AU. Modeled time-dependent spectra for energetic protons, iron, and oxygen ions are compared with ULEIS and SIS measurements onboard ACE, and with GOES-8 data. The use of the PATH code to model gradual SEP events superimposed on a pre-event background from previous SEPs is discussed.

Item Type:Article
Related URLs:
URLURL TypeDescription
Li, G.0000-0001-9313-251X
Zank, G. P.0000-0002-4642-6192
Mewaldt, R. A.0000-0003-2178-9111
Additional Information:© 2009 The American Astronomical Society. Received 2007 October 8; accepted 2008 November 21; published 2009 March 3. The authors acknowledge the partial support of NASA grants NNG04GF83G, NNG05GH38G, NNG05GM62G, a Cluster University of Delaware subcontract BART372159/ SG, and NSF grants ATM0317509, and ATM0428880. We thank the ACE ULEIS, SIS, EPAM, and SWEPAM teams and the ACE Science Center for providing the ACE data. We are also grateful for the availability of GOES-8 data from NOAA at The work at Caltech was supported by NASA under grants NAG5-12929 and NNX06AC21G. We would like to thank the referee for valuable comments.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
University of DelawareBART372159
Subject Keywords:acceleration of particles; MHD; shock waves
Issue or Number:1
Record Number:CaltechAUTHORS:20090828-135924433
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Official Citation:Using the Path Code for Modeling Gradual SEP Events in the Inner Heliosphere O. P. Verkhoglyadova, G. Li, G. P. Zank, Q. Hu, and R. A. Mewaldt 2009 ApJ 693 894-900 doi: 10.1088/0004-637X/693/1/894.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15420
Deposited By: Tony Diaz
Deposited On:11 Sep 2009 22:38
Last Modified:08 Nov 2021 23:19

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