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Exclusion of Tiny Interstellar Dust Grains From the Heliosphere

Slavin, J. D. and Frisch, P. C. and Heerikhuisen, J. and Pogorelov, N. V. and Mueller, H.-R. and Reach, W. T. and Zank, G. P. and Dasgupta, B. and Avinash, K. (2010) Exclusion of Tiny Interstellar Dust Grains From the Heliosphere. In: 12th International Solar Wind Conference. AIP Conference Proceedings. No.1216. American Institute of Physics , Melville, NY, pp. 497-501. ISBN 978-0-7354-0759-6.

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The distribution of interstellar dust grains (ISDG) observed in the Solar System depends on the nature of the interstellar medium‐solar wind interaction. The charge of the grains couples them to the interstellar magnetic field (ISMF) resulting in some fraction of grains being excluded from the heliosphere while grains on the larger end of the size distribution, with gyroradii comparable to the size of the heliosphere, penetrate the termination shock. This results in a skewing the size distribution detected in the Solar System. We present new calculations of grain trajectories and the resultant grain density distribution for small ISDGs propagating through the heliosphere. We make use of detailed heliosphere model results, using three‐dimensional (3‐D) magnetohydrodynamic/kinetic models designed to match data on the shape of the termination shock and the relative deflection of interstellar H° and He° flowing into the heliosphere. We find that the necessary inclination of the ISMF relative to the inflow direction results in an asymmetry in the distribution of the larger grains (0.1 μm) that penetrate the heliopause. Smaller grains (0.01 μm) are completely excluded from the Solar System at the heliopause.

Item Type:Book Section
Related URLs:
URLURL TypeDescription Paper
Reach, W. T.0000-0001-8362-4094
Zank, G. P.0000-0002-4642-6192
Additional Information:© 2010 American Institute of Physics. Published online 25 March 2010. We thank Joe Weingartner for sharing his grain-charging code with us, and Richard Lieu, Haru Washimi, and Xianzhi Ao for helpful comments. This work has been supported by NASA grants NNX08AJ33G, NNX09AH50G, NNX07AH18G, NNX08AJ21G, NNX09AB24G, NNX09AG29G, and NNX09AG62G, and NASA contract NNG05EC85C.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:heliosphere; interstellar matter
Series Name:AIP Conference Proceedings
Issue or Number:1216
Classification Code:PACS: 96.50.Xy,95.30.Wi,96.50.Dj,96.50.Ek,98.38.Cp
Record Number:CaltechAUTHORS:20160419-153434825
Persistent URL:
Official Citation:Exclusion of Tiny Interstellar Dust Grains From the Heliosphere J. D. Slavin, P. C. Frisch, J. Heerikhuisen, N. V. Pogorelov, H.‐R. Mueller, W. T. Reach, G. P. Zank, B. Dasgupta and K. Avinash AIP Conf. Proc. 1216, 497 (2010);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66285
Deposited By: Ruth Sustaita
Deposited On:20 Apr 2016 17:18
Last Modified:09 Mar 2020 13:19

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