Abstract: The membrane filter technique for detecting ice nuclei in atmospheric air has the disadvantage that the measured concentration decreases with the volume of air sampled. Various possible causes are investigated. The effect ...

Abstract: Experimental observations of water droplets with diameters of about 35 ? show that collisions leading to coalescence are very rare and probably do not occur. At 45 ? diameter, collisions can occur. These observations support ...

Abstract: Details are given of a technique for measuring ice nucleus concentrations using the cellulose ester membrane. filters known as ?millipores.? Some of the errors which may occur are examined in detail and it is shown that a ...

Abstract: Comparisons between ice nucleus concentrations as measured by membrane filters and cloud chambers show good agreement when natural ice nuclei are being sampled. Wide discrepancies in the case of other test aerosols, ...