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Pickup Protons: Comparisons using the Three-Dimensional MHD HHMS-PI model and Ulysses SWICS Measurements
External Online Source: doi:10.1029/2011JA017424
Author and Affiliation:
Intriligator, Devrie S.(Carmel Research Center, Space Plasma Lab., Santa Monica, CA, United States);
Detman, Thomas(Carmel Research Center, Space Plasma Lab., Santa Monica, CA, United States);
Gloecker, George(Michigan Univ., Dept. of Atmospheric, Oceanic and Space Sciences, Ann Arbor, MI, United States);
Gloeckler, Christine(Michigan Univ., Dept. of Atmospheric, Oceanic and Space Sciences, Ann Arbor, MI, United States);
Dryer, Murray(Carmel Research Center, Space Plasma Lab., Santa Monica, CA, United States);
Sun, Wei(Carmel Research Center, Space Plasma Lab., Santa Monica, CA, United States);
Intriligator, James(Carmel Research Center, Space Plasma Lab., Santa Monica, CA, United States);
Deehr, Charles(Alaska Univ., Geophysical Inst., Fairbanks, AK, United States)
Abstract: We report the first comparisons of pickup proton simulation results with in situ measurements of pickup protons obtained by the SWICS instrument on Ulysses. Simulations were run using the three dimensional (3D) time-dependent Hybrid Heliospheric Modeling System with Pickup Protons (HHMS-PI). HHMS-PI is an MHD solar wind model, expanded to include the basic physics of pickup protons from neutral hydrogen that drifts into the heliosphere from the local interstellar medium. We use the same model and input data developed by Detman et al. (2011) to now investigate the pickup protons. The simulated interval of 82 days in 2003 2004, includes both quiet solar wind (SW) and also the October November 2003 solar events (the Halloween 2003 solar storms). The HHMS-PI pickup proton simulations generally agree with the SWICS measurements and the HHMS-PI simulated solar wind generally agrees with SWOOPS (also on Ulysses) measurements. Many specific features in the observations are well represented by the model. We simulated twenty specific solar events associated with the Halloween 2003 storm. We give the specific values of the solar input parameters for the HHMS-PI simulations that provide the best combined agreement in the times of arrival of the solar-generated shocks at both ACE and Ulysses. We show graphical comparisons of simulated and observed parameters, and we give quantitative measures of the agreement of simulated with observed parameters. We suggest that some of the variations in the pickup proton density during the Halloween 2003 solar events may be attributed to depletion of the inflowing local interstellar medium (LISM) neutral hydrogen (H) caused by its increased conversion to pickup protons in the immediately preceding shock.
Publication Date: Jun 01, 2012
Document ID:
20130008806
(Acquired Feb 03, 2013)
Subject Category: GEOPHYSICS
Document Type: Journal Article
Publication Information: Journal of Geophysical Research; Volume 17; A06104
Contract/Grant/Task Num: NNX08AE40G; NASA 44A1085637
Financial Sponsor: NASA; Washington, DC, United States
Organization Source: Carmel Research Center; Santa Monica, CA, United States
Description: 8p; In English; Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: HELIOSPHERE; MAGNETOHYDRODYNAMICS; PROTONS; THREE DIMENSIONAL MODELS; ULYSSES MISSION; SOLAR WIND; INTERSTELLAR MATTER; TIME DEPENDENCE; STORMS; SIMULATION; SOLAR ACTIVITY; SHOCK WAVES
Availability Source: Other Sources
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