Recent direct measurements by satellites of cosmic dust in the vicinity of the earth
National Aeronautics and Space Administration, 1960 - Science - 11 pages
Direct measurements of the space density of cosmic dust particles in the vicinity of the earth have been made from rockets, satellites, and space probes. The largest data samples have been obtained from crystal transducer sensors that detect the impact-impulses occurring from the collision of dust particles on sensitive surfaces of space vehicles. Preliminary results from satellite 1959 ETA show: (1) over 1500 impacts and an area-time product greater than 10(exp 1O) sq cm-sec; and (2) a daily variation in the dust particle density near the earth. The dust particle instrumentation of 1959 ETA and sensor calibration techniques are discussed in this paper. The results of direct measurements from space vehicles prior to 1959 ETA are summarized with respect to 1959 ETA information.
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1959 to October 22-day period 9 SEPTEMBER Alpha and 1959 area-time product average daily interrogation average influx rate average number burst was indicative cm2-sec CORRECTED DAILY COUNTS COSMIC DUST counter system Cyclops Cores DAILY INFLUX RATE data from 1959 dust particle influx dyne-sec environmental false pulses grams H. E. LaGow impact-impulse impacting particle impactor sensors impacts per square impulse measurement interplanetary matter interrogation-quiet Jet Propulsion Laboratory km/sec LaGow and W. M. Magnetic cores magnetometer mass threshold sensitivities mean impact velocity Meteorites meter per day micro micrometeorite counter Moscow number of counts number of false OCTOBER 1959 Figure October 9 orders of magnitude piezoelectric Preliminary daily Propulsion Laboratory Translation pulse former pulse to advance Rockets Satellite 1959 Eta SATELLITES OF COSMIC SECTORS September 18 September 30 SEPTEMBER OCTOBER 1959 shown in Figure Solar Corona square meter telemetered telemetry tone burst total number transducer velocity of 30 W. M. Alexander zodiacal light