<DOC>
<DOCNO>
620
</DOCNO>
<TITLE>
earth satellite observations and the upper atmosphere .
</TITLE>
<AUTHOR>
priester, w., martin, h.a. and kramp, k.
</AUTHOR>
<BIBLIO>
nature, 188, pp 200-204. 1960 .
</BIBLIO>
<TEXT>
atmospheric densities have been derived from artificial satellites in
altitudes 200-700 km. and from rockets up to about 200 km. to consolidate
the two sets of data, h.k. kallmann suggested a model with a
exact form of this curve has now been derived . corrections for the
 is excellent .
very close correlation between atmospheric density variations/h180 km./
and the solar 20-cm. radiation implies that the origin of the'solar
effect'may lie in the absorption of solar ultra-violet radiation .
the atmospheric density curve between 180 and 200 km. shows a
temperature inversion in the fl-layer . it is not yet possible to decide
 whether solar ultra-violet radiation as well as the solar he line and
solar x-ray radiation contribute to the heating of the fl-layer .
diurnal and seasonal density variations at altitudes 210, 562 and 660
km. have been derived from variations in acceleration of three
satellites/sputnik 3, vanguard 1 and 2/ . group averages of diurnal
variations are taken from different dates within the period
may 15, 1958-october 1, 1959 . physcal conditions in the upper atmosphere
are briefly summarized ..the'solar effect'originates in the fllayer
as a result of heating by the solar he line at 304 a. diurnal
density variation at 210 km. is only a few per cent . absorption of
solar electromagnetic radiation in the f2-layer, and large heat conductivity
cause intense diurnal density and temperature variations above
</TEXT>
</DOC>
