home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Suzy B Software 2
/
Suzy B Software CD-ROM 2 (1994).iso
/
adult_ed
/
lectures
/
lecttemp.txt
< prev
Wrap
Text File
|
1995-05-02
|
1KB
|
30 lines
Ok folks, here's the posting I promised on planetary temperatures:
First some definitions,
let H represent the solar insolation (number of watts
per square meter) at 1 A.U. (earth's distance) from the
sun. Its value is 1353 watts/m^2 (m^2 means square meters)
Let s be a constant (known as the Stefan-Boltzman constant)
and its value is 5.67 x 10^-8 watts/m^2K^4)
Let D be the distance that the planet is from the sun (or
star) in A.U.
Let T be the temperature we want to calculate in Kelvins
(My peeve: NOT degrees Kelvin)
Now for the formula:
other locations will be this temperature times the cosine of
the latitude to the one-fourth power (that is, take the cosine
of the latitude and then raise that to the one-fourth power by
taking the square root twice).
Ok, why don't we play around with this for a bit. Calculate what the
temperature at the subsolar point would be if the earth were a blackbody,
had no atmosphere, and rotated synchronously. To convert a Kelvin
temperature to Celsius, subtract 273. C=K-273. How hot is this (remember
that water boils at 100 C under atmospheric pressure)? What would the
temperature be at a latitude of 60 degrees? Using your intuition, what
should happen to this calculated temperature if we account for the fact that
the earth has a substantial, rapidly rotating atmosphere?
Enjoy playing...
Dirk