A magnetohydrodynamic mechanism for generating radio waves by bright fireballs

Details A magnetohydrodynamic mechanism for generating radio waves by bright fireballs A magnetohydrodynamic mechanism for generating radio waves by bright fireballs

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983avest..17...94b&link_type=abstract

(Astronomicheskii Vestnik, vol. 17, Apr.-June 1983, p. 94-98) Solar System Research (ISSN 0038-0946), vol. 17, no. 2, Oct. 1983,

Computer Science

Sound

1

Fireballs, Magnetohydrodynamics, Meteor Trails, Meteoroids, Radio Emission, Atmospheric Entry, Geomagnetism, Radio Waves, Reynolds Number, Sound Propagation

Scientific paper

The generation of radio emission and secondary electrophonic phenomena by bright meteor fireballs is investigated theoretically. A mechanism is presented which is based on the qualitative analysis of Keay (1980): twisting of geomagnetic field lines results from turbulent motion in the ion trail and causes amplification of the field to values as high as 1000 Oe. Quantitative calculations show that only the brightest fireballs exceed the magnetic-Reynolds-number (Rem) threshold for this amplification; a 2-kg, 12-cm-diameter body traveling at 30 km/sec and having a brightness of -12 m is found to have an Rem of 25, the approximate limiting value. The field growth and decay times and the power released by field decay are estimated (for a 2-km/sec object at an altitude of 50 km) as 0.001 sec, 0.002 sec, and 2.5 GW, of which about 2.5 MW are emitted as radio waves and about 2.5 kW are converted to acoustic energy. The latter value is shown to be in general agreement with 'electrophonic-fireball' observations.

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