Accession Number:

ADA190507

Title:

The Growth Potential of Corona Discharges from Aircraft Flying in Precipitation.

Descriptive Note:

Final scientific rept. 1 Jan 83-31 Dec 85,

Corporate Author:

UNIVERSITY OF MANCHESTER INST OF SCIENCE AND TECHNOLOGY (ENGLAND)

Personal Author(s):

Report Date:

1987-11-12

Pagination or Media Count:

149.0

Abstract:

The behaviour of positive streamers in fields near and above the stability field has been studied in quasi-uniform fields of up to 18cm in extent with the aim of producing a model of the behaviour so that predictions can be made for much greater distances. In particular the evolution in air of free charge produced by the propagation has been monitored and the effect of pressure and propagation distance on this evolution studied. A frequency Gamma or coefficient gamma has been defined and measured which characterises the growth of free charge. The Schockley-Ramo theorem has been used to analyse the data which not only provides values for other relevant parameters such as attachment coefficient and streamer velocity but also provides a novel way of observing prebreakdown streamer modes. A model has been constructed which adequately accounts for the observed behaviour in small gaps but which predicts unrealistically large amounts of free charge in large gaps 1m. This suggests that some other mechanism might predominate in this case an increase in electron density leading to channel thermalisation is suggested as a possibility.

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE