On Dec. 6, 1974, a Black Brant VB rocket was launched from Cape Parry, N.W.T. into the dayside magnetospheric cleft. The prime launch criterion was the detection of 6300 ¿ emission by two ground based scanning photometers, but support was provided by two ionosondes. The payload passed through a narrow region of several ergs cm-2 sr-1 sec-1 of soft electron precipitation, a broader region of enhanced electron densities, and a similarly broad region of OI5577 and 6300 ¿ emission. At apogee of 236 km the payload had not penetrated into the 5200 ¿ emission, which had a very sharp equatorward boundary, and extended far into the polar cap, presumably as a result of anti-sunward convection.