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There are several sources of evidence on the micrometeorite environment.
Direct information has been obtained from rockets and satellites equipped with impact sensors.
In addition, the size distribution obtained from visual and radar observations of meteors may be extrapolated to the micrometeorite domain.
From the brightness of the F component of the solar corona and the brightness of the zodiacal light, an estimate of the particle sizes, concentrations, and spatial distribution can be derived for regions of space near the ecliptic plane.
Another important source of evidence only recently receiving much attention is the analysis of atmospheric dust for a meteoritic component.
The cores of deep-sea sediments and content of collectors in remote regions are valuable in this category.
The data provide a measure of the total mass of cosmic material incident upon the Earth.
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