Condign volumes 1 to 3

# UNCLASSIFIED

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where: $ \gamma $ is the density of the atmospheric medium, $ r_{s} $ the particle radius for 1.5 $ \mu m $ . The velocity of laminar noiseless motion is shown below

For this situation Re must be $ \leq1 0 $ (since the radius of the particles, their velocity for $ \gamma=1. 2 9 \mathrm{k g}. \mathrm{m}^{-3} $ must be inter-related by the conditions $ r_{a} 1 0^{5} V_{\mathrm{m}}^{-1} $ ）an electrodeless corona discharge should occur in the zones of maximum E field intensity; giving rise to light emission from the aerosol cloud. If the field intensity varies throughout the aerosol, localised luminous zones can occur - due to alternate regions of maxima and minima. Hence, it is postulated that 'navigation lights' are reported. In the $ E_{11} $ mode, for example two 'lights' or a luminous strip can be formed. If the number of discharge zones increases, the number of 'lights' will increase which will be equally distributed around the cloud as luminous zones or 'portholes'.

14. Colours It is suggested that different colours might be produced by the presence of particles in the discharge zones.

15. Electrical Attraction If the discharge connects with some conducting object (Earth's surface or aircraft), the 'beam' causes the aerosol cloud to re-orientate and even move along with a moving object such as an aircraft.

16. It is postulated that when 'searchlight beams' are reported from UAPs that most of the energy is concentrated in a discharge cone and can cause damage by the high voltage but very small intensity current. This can lead to involuntary closure of electronic and electrical circuits (switches) and have adverse health effects on humans (see Working Paper No. 25). On the ground the discharge can leave marks, bend grass etc.