Evidence for Langmuir wave tunneling in the inhomogeneous solar wind

Details Evidence for Langmuir wave tunneling in the inhomogeneous solar wind Evidence for Langmuir wave tunneling in the inhomogeneous solar wind

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1320w&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A10, pp. SSH 17-1, CiteID 1320, DOI 10.1029/2002JA009259

Astronomy and Astrophysics

Astrophysics

4

Interplanetary Physics: Solar Wind Plasma, Solar Physics, Astrophysics, And Astronomy: Radio Emissions, Interplanetary Physics: Plasma Waves And Turbulence, Interplanetary Physics: Planetary Bow Shocks

Scientific paper

Spacecraft observations of beat-like Langmuir waveforms on two orthogonal antennas in Earth's foreshock and the solar wind have been interpreted as beating associated with large-angle reflection of Langmuir waves from density inhomogeneities or nonlinear decay processes. However, the waveforms are often irregular, with uncorrelated waveform envelopes on orthogonal antennas. One interpretation is that irregular waveforms are a manifestation of the electromagnetic nature of Langmuir waves scattered to low wave numbers in the inhomogeneous solar wind. An alternative interpretation, investigated here, is that the shape of the waveform envelopes on orthogonal antennas becomes substantially different as Langmuir waves tunnel through evanescent regions, where the local plasma frequency in the inhomogeneous plasma exceeds the Langmuir wave frequency. We demonstrate that observations of uncorrelated waveform envelopes on orthogonal antennas are consistent with theoretical predictions for Langmuir wave tunneling in evanescent regions in the inhomogeneous solar wind. Incident Langmuir waves which are nearly aligned with the density gradient are also partially converted to transverse electromagnetic waves at the plasma frequency. The characteristic dual-antenna waveform signature of mode conversion is difficult to detect for typical solar wind parameters.

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