Card 6u - DIURNAL3 Solar Heating Modeling Request

This optional card defines the latitude and solar options for the diurnal solar heating modeling request.

Parameter Value Description
DIURNAL3 DIURNAL3 (or 63) Mnemonic
ID Integer Request ID number
LATITUDE Real Latitude in degrees
SOLOPT SUNDECL When Planet is set to Earth, VAL1 is the sun's declination in degrees
MEQUI When Planet is set to Earth, time is March equinox
JSOL When Planet is set to Earth, time is June solstice
SEQUI When Planet is set to Earth, time is September equinox
DSOL When Planet is set to Earth, time is December solstice
SUNRA When Planet is set to Earth, VAL1 is solar right ascension angle in degrees
DAY When Planet is set to Earth, VAL1 is the day number for year 1999
DATE When Planet is set to Earth, VAL1 is the day number and VAL2 is the month number for year 1999
OTHER For a planet other than Earth, VAL1 is the sun declination angle and VAL2 is the sun right ascension angle
VAL1 Integer Day number for the DAY and DATE values
Real Sun declination angle in degrees for the SUNDECL and OTHER values. Sun right ascension angle in degrees for the SUNRA value. 0 or blank for all other SOLOPT values
VAL2 Integer Month number for the DATE value
Real Sun right ascension angle in degrees for other planets. 0 or blank for all other SOLOPT values

LATITUDE

LATITUDE is the latitude angle in degrees of the model’s location on the planet.

SOLOPT

SOLOPT is the flag for defining the sun’s angular position with respect to the planet.

For planets other than Earth, use the SOLOPT values.

VAL1

VAL1 can be:

  • Day number in the year 1999 if SOLOPT = DAY.
  • Month number in the year 1999 if SOLOPT = DATE.
  • Sun declination in degrees if SOLOPT = SUNDECL and SOLOPT = OTHER. The sun's declination is the angle between the solar vector and the equatorial plane, positive northwards.
  • Solar right ascension angle in degrees if SOLOPT = SUNRA. The solar right ascension angle is the angle measured eastward in the Earth's equatorial plane, from the vernal equinox axis to the projection of the sun vector, onto the equatorial plane. The vernal equinox is the time when the apparent position of the sun crosses the equator moving from south to north. The vernal equinox axis is the line from the Earth's center to the point where the sun crosses the equator moving from south to north.
  • Must be blank or 0 for all other values.

VAL2

VAL2 can be:

  • Month number in the year 1999 if SOLOPT = DATE.
  • Solar right ascension angle in degrees if SOLOPT = OTHER.
  • Must be blank or 0 for all other values.

Code example


DIURNAL3 3 44.6 OTHER 48.0 20.0
DIURNAL3 3 44.6 DATE 27 1
DIURNAL3 3 44.6 DAY 27
DIURNAL3 3 44.6 SUNRA 12.5