An in situ profile 5577-¿ night airglow emission in the 100-km was obtained over the magnetic equator at Thumba, India. The height at maximum emission was at 102 1.2 km, and the half thickness of the layer was 11¿2 km. Total emission from the rocket and the ground photometer was argufd 66. From the emission the profile of density of atomic oxygen in the 100-km region was determined and had a maximum value than that expected. These results are compared with rocket results of 3.19¿1011 cm-3 at 102 km. Intensity contribution to 5577 ¿ from the F region is much smaller than that expected. These results are compared with rocket results obtained at middle and high latitudes and with Ogo 6 results.