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First theoretical predictions for dynamic spectra of the outer heliospheric radio emissions
Author(s) -
Cairns Iver H.,
Zank G. P.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900442
Subject(s) - heliosphere , physics , plasma , spectral line , spacecraft , transient (computer programming) , energetic neutral atom , shock (circulatory) , computational physics , solar wind , astrophysics , astronomy , nuclear physics , computer science , medicine , operating system
First theoretical predictions for dynamic spectra of radio emissions from the outer heliosphere are presented, based on a simple emission model and the global plasma density predicted by plasma‐neutral fluid simulations. Emission from the heliopause density ramp is not organized into slow‐drifting radiation consistent with the observed transient emissions, contrary to a widely accepted model. However, the dynamic spectra show emissions from the heliosheath beyond the heliopause reminiscent of the observed 2 kHz component. The results suggest that new emissions may be observed as spacecraft move beyond the termination shock and also place constraints on the generation processes and global plasma environment. Subject to caveats on the models used, the analysis shows that basic deficiencies exist in our understanding of the observed emissions.