PRO reference DEFE 31/118 (also AIR 22/93), Air Ministry Secret Intelligence Summary
[Prepared for Assistant Chief of Air Staff (Intelligence), Air Ministry, by D.D.I (Tech) and published in AMSIS, March 1955].
AIR MINISTRY - SECRET
INTELLIGENCE SUMMARY
Restricted
FLYING SAUCERS
An Object was reported....
The origin of the term flying saucer, as applied to
strange objects sighted in the sky, remains obscure, although
authorship is claimed by a British journalist. According to him,
whilst sitting in a Bronx cafe talking with three New York
reporters, one of whom was doodling on a piece of paper, he
observed that the drawing looked like a flying saucer.
One of the Americans decided that they had something
there and, within the hour the term was in use. Within two, it is
claimed that ninety people had reported having seen one.
Man has always instinctively looked to the sky for signs and
portents, nor has he, even to-day, quite lost his inclination to
discern and report celestial manifestations. It is not the object
of this article to decry or deprecate such reportings - as
Shakespeare wrote There are more things in heaven and earth
Horatio, than are dreamt of in your philosophy - but it is
the intention to encourage a rational approach both to the
objects themselves and to the method of their reporting.
Generally, reports are of commonplace objects which would
normally pass unobserved but which attract attention in the light
of more sensational stories, and lend support to them. Thus a
meteor or a radio sonde balloon, or even a conventional aircraft,
assume in the perception of some observers speeds, shapes and
movements which are entirely uncharacteristic. A well-known
astronomer has declared that his experience of the reports of
ordinary observers prompts him to reject 95 per cent of what they
say, particularly when he knows that they have been startled by
some sudden phenomenon which they could have observed for no more
than a few seconds.
With such reports we are not seriously concerned. There are a
number of other reports on flying saucers which are emphatic
statements of visitations from neighbouring planets, and
suchlike; these derive both from the imaginings of zealots,
admittedly quite serious and sincere in their beliefs, and from
charlatans.
Visual Sightings
Reports of sightings themselves reveal certain stereotyped
patterns. They usually describe objects as being projectile-shaped,
round, oval, or ellipsoidal; they are dazzling-bright, light,
shiny, blue-green and generally speaking, iridescent. They move
at fantastic speeds in lateral and longitudinal directions; they
also hover. Such are the basic lines of description, with
inevitable variations.
Practically all of these objects can be roughly identified as
follows:-
a.) conventional aircraft viewed by the observers from
unaccustomed angles
b) present-day jet aircraft, flying at great speeds and great
heights, mistaken by untrained and, on occasion, by experienced
observers.
c) sunlight reflections from aircraft and balloons which
themselves are too distant to be observed
d) car headlights reflected on low cloud
e) meteorological, radio sonde and cosmic research balloons of
all types
f) bright meteors and fireballs
g) planets observed at certain times of the year
h) birds
i) cloud formations
j) meteorological phenomena, such as mock moons and mock suns
There are other reports of visual sightings which are admittedly
very strange and difficult to classify. They tell of objects
which appear to change shape quickly, which move erratically and
at fantastic speeds across the sky. Under no consideration could
these reports be classified in terms of the objects listed above.
It is firmly believed that these reports are made in all
sincerity and are in fact actual sightings - but of reflections
from conventional objects.
To give a simple and practical illustrations, consider the
erratic movements of the reflection on a ceiling from a mirror
held under a light and moved even slightly by hand. Similarly, on
a vaster and more extended scale, reflections from planets,
meteors, aircraft and objects on the ground may be projected on
to cloud formations and haze. Then there are the sightings of
those planets which are low on the horizon at certain times of
the year and which appear to change colour and move erratically,
at fantastic speeds, when observed through haze, or misty
atmospheric conditions.
Many reports of such sightings have been received and here is an
example of a particular instance where a satisfactory answer was
provided. A report made by an experienced B.O.A.C. pilot of a
sighting at 19,000 ft. over Goose Bay, Labrador, on Wednesday, 30th
June, 1954, stated that objects had been observed, one primary
and six secondary, which accompanied the B.O.A.C.
aircraft for a distance of about 80 miles; all the time they were
under observation, the main object was constantly changing shape.
An investigation was carried out by the Americans who obtained a
subsequent report from a ship at sea in the same vicinity. They
described what was apparently the same phenomenon. Members of the
ships company, however, definitely identified the sighting
as the planet Mars, and gave full details of the mirage
conditions which were prevailing on that day.
Photographs
Of photographic evidence little needs to be said. There is
nothing in the world more easy to fake than a photographic film
or plate and the majority of photographs which have been seen
certainly invite suspicion. There are the few pictures that have
been published in the press from time to time which are obviously
of natural phenomena, such as mock moons and suns, and which
emphasise the probability that the objects in the others are
faked.
The two reproductions illustrate clearly the considerable
opportunities for faked photography on this subject. One in
particular could, so easily, be an industrial or operating
theatre lamp-shade complete with bulbs.
Radar Sightings
Radar sightings constitute the remaining source of
flying saucer reports and these reports, generally speaking, fall
into certain explainable categories.
Radar Echoes
Radar echoes can be produced by a variety of objects, not all of
which are visible to the human eye. The majority of solid objects
which return radar energy produce responses on the radar operators
tube which are easily recognised: moving objects such as aircraft
and birds are normally readily identifiable by the size and shape
of the response and by the velocities, altitudes and movement
they exhibit. Meteorological balloons might also be included in
this group of identifiable objects as they normally produce quite
distinctive echoes, particularly as many of them carry reflectors
specially designed to assist in the plotting of their course by
radar. However, some balloons, such as those used for ionospheric
sounding, fly at altitudes beyond the reach of aircraft and
travel with the upper winds at speeds often in excess of 100 m.p.h.
Radar returns from such balloons, when first encountered, could
mystify a radar operator and give the impression that a flying
saucer has been sighted. On the rare occasions when reports of
unidentified objects have their origin in one of these solid
bodies it is usually a comparatively simple matter to identify
the object by enquiries addressed to the appropriate authority.
Within a group of radar targets which are not controlled or
released by man can be included birds, meteorological and
astronomical targets. Birds are of little concern as their
smallness prohibits responses from them except at very short
ranges but, from the other targets, responses with quite unusual
characteristics may be obtained.
Echoes from Precipitation
Radar echoes may be produced by condensed water vapour in the
form of raindrops, ice crystals or snow, a phenomenon which has
been put to good use in civil aviation to assist pilots in
avoiding dangerous cloud formations.
Responses on a radar tube from these targets may cover a
considerable area, exhibit irregular, diffused boundaries and
have a rapidly fluctuating intensity. Movement will generally be
related to the speed of the main air current in which the rain is
situated, and it may be anything from zero to 100 m.p.h. or more,
whilst the target altitude may range from ground to 40,000 ft.
Generally the nature of the target is obvious by its size and by
the pattern of the responses, but the picture changes with time
and may appear unusual and confusing to an inexperienced operator.
Non-Standard Atmospherical Conditions
Under certain meteorological conditions inhomogeneities occur in
the atmosphere, and these may be responsible for some unusual
radar echoes. The required condition can occur up to heights in
the order of 200 miles but the strength of signals returned from
such nebulous targets is likely to be too low to produce a
distinguishable response except on very rare occasions. Perhaps
it is this very rarity which assists in the creation of another
saucer.
Unusual meteorological conditions can also cause radar signals to
be returned from objects at distances far in excess of the normal
range of the radar equipment. Responses caused by this anomalous
propagation are superimposed on the usual radar picture of the
area and can lead to confusion. The effect occurs most frequently
in tropical and sub-tropical areas and usually persists for an
appreciable time, sometimes for an hour or more. The effect is
well known and because of its relative stability and duration
would not normally give rise to unusual reportings.
Ionised Gases
It has been suggested that ionised gas clouds in the atmosphere
produce a type of radio echo which may be confused with those
from tangible objects. Although radio energy is undoubtedly
reflected and refracted by ionised gases (long distance, short
wave communications depend on this very fact) the effect falls
off very rapidly above, say, 30 Mc/s, whilst 60 Mc/s appears to
be the upper limit at which it has been recorded. Some of the
early radar equipment still in use does operate within these
frequency limits but it is quite incapable of the definition
necessary to contribute to the notion of flying saucers. Further,
except for the very short-lived effects in the wake of
meteorites, ionised gases in quantities required appear rarely to
exist at heights as low as 35 miles.
Meteors and Meteorites
It has been known for many years that radio energy is reflected
by meteors, and knowledge of the fact has proved valuable in the
hands of astronomers. Meteors reach the outer fringe of the earths
atmosphere in numbers as high as 100,000 per hour but only very
few survive long enough to come within the range of radar, the
majority being vapourised by frictional heat. Meteors approach
the earth at all angles of incidence, from vertical to glancing,
and at velocities in the order of 10,000 m.p.h. Radar responses
from these astronomical targets appear to be rare, but such
targets may produce responses at any range or altitude, subject
only to the capabilities of the radar set itself and to the size
of the meteor.
Unlike aircraft and balloons the presence of these meteorological
and astronomical targets cannot be verified after the event
except in the most general way: by carefully sifting operators
reports, and studying meteorological conditions on the paths of
expected meteor shows at the time of the incident, it is often
possible to produce a tentative explanation for the responses
but, because of the transitory nature of the target, it is seldom
conclusive.
Radar Equipment Interference
Another possibility which deserves consideration is interference
from other radar equipment. Generally, the cause of this type of
spurious response is immediately obvious, but it can happen that
the characteristics of the two radar sets bear such a
relationship that the interference gives rise to one, sometimes
two, bright spots on the radar tube, which may for a short time
exhibit some of the characteristics of an actual target. Even in
this case, the true nature of the response can usually be quickly
determined except when the interfering radar set is mobile and
the operator is unaware of its presence.
Investigation
The investigation of reports of flying saucers presents very
apparent difficulties, the major one of which is that, ninety-nine
times out of a hundred, the scent is completely cold. It is only
fair to point out that in every other case, i.e. when reports are
telephoned and promptly checked on the spot, the sighted object
has been identified as a balloon or a conventional aircraft. For
the investigation of cold scent reports there are
various media through which information and assistance are
obtained: the Royal Observatory and the Meteor Section of the
British Astronomical Association give information on meteors,
fire balls and all astral phenomena; the Meteorological Office,
Royal Air Force Station, Cardington, London Airport and Bristol
University cover radio sonde, cosmic research and other balloons;
Fleet Air Arm and Royal Air Force units and formations give
details of aircraft movements; and the civil police assist in the
investigation of all types of reports.
From these sources has come most of the information leading to
the true identity of reported flying saucers, and their co-operation
in the tedious process of investigation in invaluable. An
instance is given of a report by a man who, returning home late
one night, stated emphatically that he had seen a flying saucer
hovering in a field quite a short distance from his point of
observation. The thing, according to his story,
hovered and moved slowly up and down. Evidence was obtained from
the local police to the effect that on the night, at that time,
and in that place, an unfortunate farmer had lost a hayrick by
fire!
Generally it can be accepted that, of all reports received, the
vast majority are of things identifiable as one of the
conventional objects enumerated above; the remainder are
unexplained because the evidence is either too sparse, too vague,
or too contradictory.
As a matter of interest, where the reports received are explained
it is mainly in terms of meteors, planets, balloons and aircraft.
Noteworthy among the other explanations are included aircraft
with rocket-assisted take off, car headlights reflected on low
cloud, and the recently adopted navigation lighting system of
American civil aircraft.
Conclusion
The civilised world has become conscious or, perhaps it would be
more apt to say, it has been made conscious of flying saucers or
unidentified flying objects: whenever an airborne body is not
clearly recognised as something conventional it becomes a mystery
whose magnitude varies according to the observers
susceptibility. Most people are very susceptible to the influence
of the Press or the radio. A news item on a flying saucer
promptly induces a spate of reported new sightings.
Sensible and rational reporting of unidentified flying objects is
the duty of all who are concerned with flying. Apart from astral
or meteorological phenomena, which are of interest to specialists
in these matters, there is always the chance of observing foreign
aircraft of revolutionary design. As for controlled
manifestations from outer space, there is no tangible evidence of
their existence.