660700Aurora4_p2

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Aurora Section, Bulletin No.14.                                                  -2-


observations should be entered in the left-hand column; four per hour should suffice.
Observations need not be made at the quarter hours, but these are preferred for ease
of cauparison among observers. The right-hand column is for remarks on colour,
motion, time of greatest activity and time of transition between forms. Examples follow:


-  Aurorae with lower borders at elevations between 00 and 100 are listed in the first
   column, as at 19:15 and 19:30 when a medium intensity glow was seen at the northern
   horizon.

-  Aurorae with lower borders between 100 and 14ø are listed in the second column. The
   only entry shows no aurora in this region at 19:15, at 19:30 the glow to the north
   had spread above 10ø but since the glow was listed in the 0° to 10° region, no
   separate listing of it is made in the 10° to 14° region.

-  Most of the display occupied the 14ø to 21ø region of the sky. A medium homogeneous
   arc was seen at 19:00. By 18:15 the arc had a red lower border. The homogeneous
   arc had changed into a rayed arc with short rays by 18:45. At 19:15 the homo-
   geneous arc reappeared, weakening and becoming very quiet by 20:00. After 20:30
   no aurora was observed in this region.

-  The sky between 21° and 32° contained the lower borders of several aurora. At 19:15
   a medium rayed arc with fainter rays occupied this region persisting past 19:30 and
   observed again at 20:30 when its colour was green; at this time motion was noted
   along the arc moving eastward. At 22:00 a medium green yellow quiet homogeneous
   arc was awarent in the sky between 21° and 32°.

-  At 19:30 long rays appeared in the north-eastern sky extending close to the zenith;
   since these rays originated near the extreme end of the rayed arc listed in the 21°
   to 32° region, they are noted only under the remarks column. On the other hand,
   rays were noted at 20:30 which were independent of all other listed forms. These
   separate rays are in the region 32° to 62° where their lower borders were noted.

The use of these forms should prove helpful to aurora observers, both as a personal
record of their work and also for supplying data to the Society. Most Centres should
be able to stencil their own versions of these; however, smaller Centres may wish to
procure copies from larger Centres such as Edmont on and Montreal where aurora programs
are well established.

Observers who experience difficulty with the format and use of these two Loins are
referred to the N.R.C. Bulletin "I.G.Y. Visual Aurora Program for Canada, General In-
structions". Copies may be obtained from the Auroral Centre, National Research
Council, Ottawa, or the National Co-ordinator for the Aurora Program.

                                      Earl Milton, National Co-ordinator,
                                      Aurora Section,
                                      Standing Committee on Observational Activities,
                                      2 Spence Street, Apt. 12,
July 1966.                            Regina, Sask.

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