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Solar Energetic Particle Anisotropies from the ACE Solar Isotope Spectrometer

Leske, R. A. and deNolfo, G. A. and Cohen, C. M. S. and Christian, E. R. and Cummings, A. C. and Mewaldt, R. A. and Slocum, P. L. and Stone, E. C. and von Rosenvinge, T. T. and Wiedenbeck, M. E. (2001) Solar Energetic Particle Anisotropies from the ACE Solar Isotope Spectrometer. In: Proceedings of the 27th International Cosmic Ray Conference. Vol.8. Copernicus Systems and Technology GmbH , Berlin, Germany, pp. 3269-3272.

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Although not specifically designed for it, the Solar Isotope Spectrometer (SIS) on the Advanced Composition Explorer spacecraft is sensitive to particle anisotropies of heavy ions at energies of tens of MeV/nucleon. Using the arrival time of each particle (to the nearest second) and the trajectory measured with the instrument's position sensing detector, the arrival direction of each particle may be determined to ˜30° in azimuth about the spacecraft spin axis and to better than 1° in zenith angle from the axis. This allows the angular distribution of particles to be measured within the ˜145° wide field of view of the instrument, from which the intensities both along the field and perpendicular to it can usually be determined. We describe how anisotropies are obtained from SIS and present examples demonstrating some of the capabilities of SIS in studying anisotropies. With further analysis, SIS can contribute to studies exploring the dependence of particle angular distributions on energy and species.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Leske, R. A.0000-0002-0156-2414
Cohen, C. M. S.0000-0002-0978-8127
Christian, E. R.0000-0003-2134-3937
Cummings, A. C.0000-0002-3840-7696
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© Copernicus Gesellschaft 2001. We thank Andrew Davis for providing the sunpulse timing data and for helpful discussions. We appreciate the work of the EPAM and MAG science teams in generating their Level 2 data products and that of the ACE Science Center in making these data readily available. Details on solar and interplanetary activity were obtained from NOAA through the Space Environment Center web site. This research was supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, and the Goddard Space Flight Center.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2001-48
Record Number:CaltechAUTHORS:20150303-111154005
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55465
Deposited By: Deborah Miles
Deposited On:05 Mar 2015 03:15
Last Modified:09 Mar 2020 13:19

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