Apollo 15 ALSEP anomalies

Abstract

Since deployment of the Apollo 15 ALSEP, various anomalous events have occurred within the package. Certain of these events appear to be cyclical in nature, resulting from the inexorable temperature changes that occur during each lunar cycle. These events are approximately predictable based on past occurrences. Other events although influenced by changing temperatures do not occur consistently enough to be classified as periodic. Finally, there are those events that occur sporadically over the entire lunation. Most notable of these are functional changes due to spurious commands generated within the command receiver.