Abstract
We consider emission of photons in the 2–3 kHz band excited by Langmuir turbulence upstream of a propagating shock caused by a solar wind transient approaching the heliopause. We estimate possible frequency drifts resulting either (1) from shock motion on density gradient near the heliopause or (2) from Fermi-type interactions of photons trapped in transient cavities. We discuss the implications of these factors for the interpretation of frequency drifts observed by Voyagers during the 1983 and 1992 events in the context of a heliosphere of about 100 A.U.
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