Can a charge-exchange induced density rise at the heliopause explain the frequency drift of the 3 kHz Voyager signal?

Details Can a charge-exchange induced density rise at the heliopause explain the frequency drift of the 3 kHz Voyager signal? Can a charge-exchange induced density rise at the heliopause explain the frequency drift of the 3 kHz Voyager signal?

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2777c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2777-2780

Astronomy and Astrophysics

Astronomy

4

Charge Exchange, Drift Rate, Dynamic Models, Heliosphere, Plasma Density, Plasma Drift, Plasma Frequencies, Radio Emission, Solar Wind, Astronomical Models, Computerized Simulation, Magnetohydrodynamic Flow, Plasma Interactions, Plasma Layers, Shock Wave Interaction, Shock Waves, Very Low Frequencies, Voyager Project, Wave Propagation

Scientific paper

A physical model for the recently advanced interpretation of the 3 kHz data is proposed. Basing on the results of the flow dynamical model of the heliosheath we conclude that the post-shock solar wind (SW) plasma, cooled down by charge-exchange with neutral hydrogen of LISM origin, should form a high density layer on the inner side of the surface of the heliopause. The model allows us to estimate the surface of the heliopause. The model allows us to estimate the plasma density profile and the size of the layer. These we use as input for MHD calculation of (1) a transient shock moving through this layer towards the heliopause and (2) of resulting 2 omegap (frequency) drift of VLF emissions generated at the shock. For the heliopause distance L = 150 - 180 A.U. our model reproduces both the time duration of the emissions and their typical frequency drifts.

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