First results of the micrometeoroid experiment S 215 on the HEOS 2 satellite

Details First results of the micrometeoroid experiment S 215 on the HEOS 2 satellite First results of the micrometeoroid experiment S 215 on the HEOS 2 satellite

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23..215h&link_type=abstract

(COSPAR, Plenary Meeting, 16th, Konstanz, West Germany, May 23-June 5, 1973.) Planetary and Space Science, vol. 23, Jan. 1975, p

Computer Science

11

Micrometeoroids, Particle Flux Density, Particle Size Distribution, Satellite Observation, Satellite-Borne Instruments, Experiment Design, Grazing, Heos Satellites, Mission Planning, Particle Collisions

Scientific paper

The experiment measures the mass, speed and approximate influx direction of the micrometeoroids. The temporal distribution of the particles indicates three different categories. Category 1 consists of three large groups of particles (swarms), each of which encountered the detector within some tens of minutes. Category 2 includes eight small groups of particles, each of which was detected within hours. Category 3 is made up by the remaining particles, which are randomly distributed. The swarms are of very recent origin, possibly supplied by (1) meteoroids grazing the earth's atmosphere, (2) ejecta from the moon, and (3) collisions of dust particles. The groups may be dissipated swarms or particles from the outer zone of swarms. The randomly distributed particles consist of sporadic interplanetary particles and completely dissipated groups. The comparison of both the particle rates (number of detected particles per day) and the cumulative particle flux curves for the earth's apex, antiapex, and ecliptic north and south directions shows that the rates vary only within a factor of 2, whereas the particle flux is extremely anisotropic.

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