Articles | Volume 4, issue 3
Atmos. Chem. Phys., 4, 737–740, 2004

Special issue: Meteors in the atmosphere (Arecibo Meteor Radar Workshop...

Atmos. Chem. Phys., 4, 737–740, 2004

  18 May 2004

18 May 2004

Evaporation of high speed sporadic meteors

E. Murad1 and C. Roth2 E. Murad and C. Roth
  • 1Air Force Research Laboratory, Space Vehicles Directorate, Hanscom AFB, MA 01731, USA
  • 2Radex, Inc., 3 Preston Court, Bedford, MA 01730, USA

Abstract. Recent measurements conducted at the Arecibo Observatory report high-speed sporadic meteors having velocities near 50 km/s. The results seem to indicate a bimodal velocity distribution in the sporadic meteors (maxima at ~20 km/s and ~50 km/s). The particles have a maximum mass of ~1µg. This paper will present an analysis of the ablation of 1µg meteoroids having velocities of 20, 30, 50, and 70 km/s. The calculations show that there is fractionation even for the fast meteoroids, the effect being particularly noticeable for the 1µg sporadic particles, and less so for the heavier particles. The relevance of the calculations to the radar observations of the sporadic meteors will be discussed.

Final-revised paper