Page "learned" Paragraph 101
from
Brown Corpus
The impact rate on 1958 Alpha for 153 events was Af for particles of mass greater than Af ( Dubin, 1960 ) ; ;
this mass threshold was derived from the detector calibration and an assumed impact velocity of Af.
The data show daily and diurnal variations.
Ninety per cent of the 153 recorded impacts occurred between midnight and noon, and from day to day the variation of the rate was as much as an order of magnitude.
One may conclude that most of the detected micrometeoritic material is concentrated in orbital streams which intersect the Earth's orbit.
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