  Issues relating to extensive air showers observation by a space-borne
fluorescence detector and the effects of clouds on the observations are
investigated using Monte Carlo simulation. The simulations assume the presence
of clouds with varying altitudes and optical depths. Simulated events are
reconstructed assuming a cloud-free atmosphere. While it is anticipated that
auxiliary instruments, such as LIDAR (LIght Detection And Ranging), will be
employed to measure the atmospheric conditions during actual observation, it is
still possible that these instruments may fail to recognize the presence of a
cloud in a particular shower observation. The purpose of this study is to
investigate the effects on the reconstructed shower parameters in such cases.
Reconstruction results are shown for both monocular and stereo detectors and
for the two limiting cases of optically thin, and optically thick clouds.
