INDOEX C-130:  FLIGHT 2 18 February 1999

Summary

The second Indoex flight took off at 4:40 GMT and was a combined clear-air
radiative-closure and cloudy-air indrect radiative-forcing study near 11N and
71E.  The SABL lidar was down, and detailed survey of boundary layer aerosol
was not possible for either study, but favorable conditions were otherwise
present for both objectives.  A KCO pass was made at the beginning of the
flight and a lidar comparison at the end.  Two MCR turns were done at 6:49
where a partial ribbon cloud was in scene and another over a clear-air scene
near 7:24.  An AVHRR satellite intercomparison leg was carried out at 10:51
near 10.3N and 71.12E).

The clear-air closure segment started at 6:55 and ended at 9:00.  It included
a 15min MCR maneuver at 6:49 at 18,000ft.  A very sharp haze layer extended
from 10,000ft to the surface.  The haze appeared to have a thick upper layer
separate from the lower layer.  The upper layer appeared homogeneous, but
lower layer was more layered and variable.

Difficulty in finding a dense enough cloud region required us to move to 9.55N
and 71.82E.  A suitable region was found but only sufficient time for three
15min legs and profiles remained.  Even so, cloud physics and radiation
measurements were made successfully.  Cloud base was at 800ft and cloud top
at 3,900ft.  A Cloud leg at 2,500ft showed a LWC of only 0.1-0.2 g/m3 and
cloud droplet number concentrations to range from 50-350/cm3 even though CN
concentrations were 1,500/cm3.

Satellite communication with the Ops. Center was tested sucessfully, but
calls were only possible from the C-130 to the Ops. Center.