Electric Antennae in the Outer Heliosphere - the Importance of Being Stable

Details Electric Antennae in the Outer Heliosphere - the Importance of Being Stable Electric Antennae in the Outer Heliosphere - the Importance of Being Stable

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...224l...5m&link_type=abstract

Astronomy and Astrophysics, Vol. 224, NO. OCTII, P. L5, 1989

Astronomy and Astrophysics

Astrophysics

5

Scientific paper

In the distant solar wind, the temperature decreases so much that a typical spacecraft can move faster than the thermal electrons. Ordinary electric antennae then become unstable at frequencies of the order of magnitude of the plasma frequency, yielding unreliable electric field measurements. A spacecraft emits damped plasma waves by a Cerenkov process and should have a very perturbed wake. These effects could appear on Voyager and be erroneously attributed to a genuine radio-emission. They should also be taken into account for designing reliable antennae for future missions in the outer heliosphere.

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