58:2.1
The planetary atmosphere filters through to the
earth about one two-billionths of the sun's total light emanation. If
the light falling upon North America were paid for at the rate of two
cents per kilowatt-hour, the annual light bill would be upward of 800
quadrillion dollars. Chicago's bill for sunshine would amount to
considerably over 100 million dollars a day. And it should be remembered
that you receive from the sun other forms of energy -- light is not the
only solar contribution reaching your atmosphere. Vast solar energies
pour in upon Urantia embracing wave lengths ranging both above and below
the recognition range of human vision.
58:2.2
The earth's atmosphere is all but opaque to much
of the solar radiation at the extreme ultraviolet end of the spectrum.
Most of these short wave lengths are absorbed by a layer of ozone which
exists throughout a level about ten miles above the surface of the
earth, and which extends spaceward for another ten miles. The ozone
permeating this region, at conditions prevailing on the earth's surface,
would make a layer only one tenth of an inch thick; nevertheless, this
relatively small and apparently insignificant amount of ozone protects
Urantia inhabitants from the excess of these dangerous and destructive
ultraviolet radiations present in sunlight. But were this ozone layer
just a trifle thicker, you would be deprived of the highly important and
health-giving ultraviolet rays which now reach the earth's surface, and
which are ancestral to one of the most essential of your vitamins.
58:2.3
And yet some of the less imaginative of your
mortal mechanists insist on viewing material creation and human
evolution as an accident. The Urantia midwayers have assembled over
fifty thousand facts of physics and chemistry which they deem to be
incompatible with the laws of accidental chance, and which they contend
unmistakably demonstrate the presence of intelligent purpose in the
material creation. And all of this takes no account of their catalogue
of more than one hundred thousand findings outside the domain of physics
and chemistry which they maintain prove the presence of mind in the
planning, creation, and maintenance of the material cosmos.
58:2.4
Your sun pours forth a veritable flood of
death-dealing rays, and your pleasant life on Urantia is due to the
"fortuitous" influence of more than two-score apparently accidental
protective operations similar to the action of this unique ozone layer.
58:2.5
Were it not for the "blanketing" effect of the
atmosphere at night, heat would be lost by radiation so rapidly that
life would be impossible of maintenance except by artificial provision.
58:2.6
The lower five or six miles of the earth's
atmosphere is the troposphere; this is the region of winds and air
currents which provide weather phenomena. Above this region is the inner
ionosphere and next above is the stratosphere. Ascending from the
surface of the earth, the temperature steadily falls for six or eight
miles, at which height it registers around 70 degrees below zero F. This
temperature range of from 65 to 70 degrees below zero F. is unchanged in
the further ascent for forty miles; this realm of constant temperature
is the stratosphere. At a height of forty-five or fifty miles, the
temperature begins to rise, and this increase continues until, at the
level of the auroral displays, a temperature of 1200° F. is attained,
and it is this intense heat that ionizes the oxygen. But temperature in
such a rarefied atmosphere is hardly comparable with heat reckoning at
the surface of the earth. Bear in mind that one half of all your
atmosphere is to be found in the first three miles. The height of the
earth's atmosphere is indicated by the highest auroral streamers --
about four hundred miles.
58:2.7
Auroral phenomena are directly related to
sunspots, those solar cyclones which whirl in opposite directions above
and below the solar equator, even as do the terrestrial tropical
hurricanes. Such atmospheric disturbances whirl in opposite directions
when occurring above or below the equator.
58:2.8
The power of sunspots to alter light frequencies
shows that these solar storm centers function as enormous magnets. Such
magnetic fields are able to hurl charged particles from the sunspot
craters out through space to the earth's outer atmosphere, where their
ionizing influence produces such spectacular auroral displays. Therefore
do you have the greatest auroral phenomena when sunspots are at their
height -- or soon thereafter -- at which time the spots are more
generally equatorially situated.
58:2.9
Even the compass needle is responsive to this
solar influence since it turns slightly to the east as the sun rises and
slightly to the west as the sun nears setting. This happens every day,
but during the height of sunspot cycles this variation of the compass is
twice as great. These diurnal wanderings of the compass are in response
to the increased ionization of the upper atmosphere, which is produced
by the sunlight.
58:2.10
It is the presence of two different levels of
electrified conducting regions in the superstratosphere that accounts
for the long-distance transmission of your long- and short-wave
radiobroadcasts. Your broadcasting is sometimes disturbed by the
terrific storms which occasionally rage in the realms of these outer
ionospheres.