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Martinović_2019_ApJ_879_43.pdf
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1.300Mb
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Final Published Version
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IOP PUBLISHING LTDCitation
Martinovic, M. M., Klein, K. G., & Bourouaine, S. (2019). Radial Evolution of Stochastic Heating in Low-β Solar Wind. arXiv preprint arXiv:1905.13355.Journal
ASTROPHYSICAL JOURNALRights
© 2019. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We consider the radial evolution of perpendicular ion heating due to the violation of magnetic moment conservation caused by Alfven and kinetic Alfven wave turbulence. This process, referred to as stochastic heating (SH), can be quantified by the ratio between the average velocity fluctuations at the ion gyroradius and the perpendicular ion thermal speed epsilon delta v/v(t perpendicular to). Using 17 yr of Helios observations, we constrain how much energy could be dissipated by this mechanism between 0.29 and 0.98 au. We find that SH likely operates throughout the entire inner heliosphere, but that its radial dependence is steeper than that of empirically derived dissipation rates, with r(-2.5) being compared with r(-2.08). This difference is significantly increased in fast solar wind streams to r(-3.1) compared with r(-1.8).ISSN
0004-637XEISSN
1538-4357Version
Final published versionSponsors
Ministry of Education, Science and Technological Development of Republic of Serbia [ON176002]; NASA [NNX16AM23G]ae974a485f413a2113503eed53cd6c53
10.3847/1538-4357/ab23f4