A bright feature observed on Jan. 24--26, 1992 with the soft X-ray telescope on the YOHKOH spacecraft and with the coronameter at the Mauna Loa Solar Observatory assumed the appearance of a coronal helmet streamer as it slowly expanded. Mauna Loa observations from Jan. 22--24 indicate that a prominence eruption and coronal mass ejection occurred before this feature was seen. We interpret the Jan. 24--26 observations as evidence for ''reformation'' of a magnetically closed helmet structure as a consequence of magnetic reconnection that proceeded along a vertical magnetic neutral sheet formed by the mass ejection. ¿ American Geophysical Union 1993