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Forecasting the arrival of shock-accelerated solar energetic particles at Earth

Cohen, C. M. S. and Mewaldt, R. A. and Cummings, A. C. and Leske, R. A. and Stone, E. C. and Slocum, P. L. and Wiedenbeck, M. E. and Christian, E. R. and von Rosenvinge, T. T. (2001) Forecasting the arrival of shock-accelerated solar energetic particles at Earth. Journal of Geophysical Research A, 106 (A10). pp. 20979-20983. ISSN 0148-0227. doi:10.1029/2000JA000216.

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Energetic particles accelerated at interplanetary shocks can result in an increased radiation dose for astronauts as well as an increased risk to satellite hardware. These shocks are known to occasionally accelerate protons to energies greater than 100 MeV and can result in very high fluxes. Advanced warning of the arrival of strong interplanetary shocks can enable steps to be taken to minimize the potential risks. In an effort to monitor and assess the radiation risk to astronauts, two real-time count rate monitors were implemented in the Solar Isotope Spectrometer (SIS) on the ACE spacecraft. These rates measure protons with energies >10 and >30 MeV. Since ACE is located at the L1 Lagrangian point, these rates provide information and warning up to 1 hour before an interplanetary shock reaches Earth. Using ACE and GOES, data we have examined examples of shocks and associated energetic particles that have been detected at ACE and were later observed near Earth in an effort to develop more fully the forecasting capability of ACE. Because of the limited amount of solar activity during 1997–1999, this current work is primarily a proof of concept.

Item Type:Article
Related URLs:
URLURL TypeDescription
Cohen, C. M. S.0000-0002-0978-8127
Mewaldt, R. A.0000-0003-2178-9111
Cummings, A. C.0000-0002-3840-7696
Leske, R. A.0000-0002-0156-2414
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Christian, E. R.0000-0003-2134-3937
Additional Information:© 2001 by the American Geophysical Union. Received June 30, 2000; revised October 25, 2000. Paper number 2000JA000216. We thank the SWEPAM and MAG teams and the ACE Science Center [or providing level 2 data for shock analysis. We thank Adam Szabo for helpful discussions regarding the shock calculations. The GOES data were contributed by the U.S. Department of Commerce, NOAA, Space Environment Center. This work was supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, and the Goddard Space Flight Center. Janet G. Luhmann thanks Stephen W. Kahler and Ronald D. Zwickl for their assistance in evaluating this paper.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Goddard Space Flight CenterUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2001-07
Issue or Number:A10
Record Number:CaltechAUTHORS:20140827-085913469
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Official Citation:Cohen, C. M. S., R. A. Mewaldt, A. C. Cummings, R. A. Leske, E. C. Stone, P. L. Slocum, M. E. Wiedenbeck, E. R. Christian, and T. T. vonRosenvinge (2001), Forecasting the arrival of shock-accelerated solar energetic particles at Earth, J. Geophys. Res., 106(A10), 20979–20983, doi:10.1029/2000JA000216.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48963
Deposited By: Jason Perez
Deposited On:27 Aug 2014 18:12
Last Modified:10 Nov 2021 18:38

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