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A study of density modulation index in the inner heliospheric solar wind during solar cycle 23 View all abstracts by submitter

Susanta Kumar Bisoi   Submitted: 2014-08-19 19:51

The ratio of the rms electron density fluctuations to the background density in the solar wind (density modulation index, εN \equiv Δ{N}/N) is of vital importance in understanding several problems in heliospheric physics related to solar wind turbulence. In this paper, we have investigated the behavior of εN in the inner-heliosphere from 0.26 to 0.82 AU. The density fluctuations Δ{N} have been deduced using extensive ground-based observations of interplanetary scintillation (IPS) at 327 MHz, which probe spatial scales of a few hundred km. The background densities (N) have been derived using near-Earth observations from the Advanced Composition Explorer (ACE). Our analysis reveals that 0.001 ≤sssim εN ≤sssim 0.02 and does not vary appreciably with heliocentric distance. We also find that εN declines by 8% from 1998 to 2008. We discuss the impact of these findings on problems ranging from our understanding of Forbush decreases to the behavior of the solar wind dynamic pressure over the recent peculiar solar minimum at the end of cycle 23.

Authors: Susanta Kumar Bisoi, P. Janardhan, M. Ingale, P. Subramanian, S. Ananthakrishnan, M. Tokumaru, and K. Fujiki
Projects: ACE

Publication Status: ApJ (in Press)
Last Modified: 2014-08-20 09:47
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