New constraints from the inner source pickup ions on the dust population near the sun

Details New constraints from the inner source pickup ions on the dust population near the sun New constraints from the inner source pickup ions on the dust population near the sun

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh51d0300a&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH51D-0300

Physics

6015 Dust, 6213 Dust, 2129 Interplanetary Dust

Scientific paper

There are two main sources of pickup ions (PUIs) in the heliosphere: the interstellar source and the inner source, which is produced due to solar wind interaction with heliospheric grains. The inner-source PUIs are found to dominate inside 1 AU, and have a peak source rate between 10 and 30 Rs. The inner-source PUIs are currently thought to be generated when solar wind passes through extremely small grains. The exiting solar wind particles, mainly neutrals at solar wind energies, are then ionized and picked up by the solar wind. The IDPs in this case must be small enough, a few tens of a nm at most, to act as thin foils by allowing the solar wind ions to pass through the grains without sputtering significant mass. The inner-source PUIs have been studied thus far mainly at solar minimum. We present a comparison between three selected periods at solar minimum and solar maximum. During these periods the inner source was remarkably stable. Moreover, we show that the inner source is consistent with randomly distributed sources. These new results add two constraints to the existing constraints from the inner source on the dust population near the sun. We drew a matrix considering these constraints and evaluating the mechanisms that have been proposed.

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