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THE ROYAL ASTRONOMICAL SOCIETY OF CANADA STANDING COMMITTEE ON OBSERVATIONAL ACTIVITIES AURORA SECTION Bulletin No. 4 To obtain more information from our aurora observers and to establish an R.A.S.C. auroral data file, this bulletin describes two stumnary forms. These can easily be duplicated by Centres or individual observers and are intended as a supplenent to, not a replacement for, the present N.R.C. aurora report form. MONTHLY AURORA SUMMARY: At the top, the name of the observer, month and year, station or location where the observations have been made, and the time used during the entire month should be given. Below this, a list of standard symbols is found for use singly or in combination. In the main section, observational data should be entered - across the page ar columns for the various hours of each night, down the page are tars for the days of the month. For each hour of the night when an observation has been made, an appropriate symbol should be entered along the daily rows. Four examples are shown: - On July 5-6 the sky was clear between 22h and 02h. Twilight interfered with ob- servation until 23h, after that no aurora was seen during three consecutive hours of observing. - On July 10-U the sky was overcast between 22h and OOh. Between 00h and 01h the sky partially cleared but the northern sky was still clouded over. During the next hour the sky was partially cloudy aU over, and by 02h the sky had again be- came overcast. - On July 22-23 a weak aurora was observed prior to 23h and again after 00h. No observation was made between 23h and 00h. - On July 23-24 the sky was partially cloudy between 21h and 02h. The north was clear during most of this interval but no aurora was seen before 22h the to twi- light. After 22h no aurora wag observed in the north until 01h when a medium aurora was noted, After 02h the sky cleared and the medium aurora continued. DAILY AURORA SUMMARY: This is used only when an aurora has been seen and recorded on the N.R.C. Visual Aurora Report form; the display is then summarized on the daily summary form for use by an R.A.S.C. Centre Recorder or the National Co-ordinator. At the top are spaces where the observer's name, location or station, and the time used for the observations should be entered. A short list of preferred symbols for the auroral forms and their intensities follows. The main portion is for the summary of the observations. Elevations indicating the position of the aurora relative to the northern horizon appear across the top. Angles larger than 90° are south of the zenith, 180° is the southern horizon. Times of