122. Noves vo THe Extra OpservATIONS OF MAGNETOMETERS, FesruARY 7—Manrcu 7, 1845, 
NOTES ON THE AURORZ BOREALES SEEN AT MAKERSTOUN. 
ad bh. om: 
Feb. 7 14 15. Pulsations without doubt, the wedge of pure sky pointing nearly NNE. as on February Ist; 
quent pulsations to NE., and especially on the edges of the loose cirro-stratus to NE. 
Very fine milky aurora; nearly as distinct as on February Ist, bright to W., with pulsations ; parallel 
bars of dark and light sky, altitude about 45° from W., pointing nearly NNE.; pulsations all 
round ; stars getting brighter to S. 
Aurora much off; stars very clear and distinct; very faint aurora now; very faint pulsations t 
neither would have been detected unless carefully watched. 
Much as at 40™; most distinct about NNE., where the point of the wedge of sky is still well seen 
Very faint ; as before. 
Bright again with pulsations ; nearly the whole sky covered. An amorphous mass of cirrous cloud 
on SSW, hori izon, which seems to pulsate (or merely reflects the pulsations of the rest of the sky 2); 
it is dense on one side, and extends into thin cirri on the other (W.) side. 
Faint again, with pulsations around. 
The cloud to SSW. has extended into long strips of cirrus ; radiating from that pot, it completely 
obscures the stars, excepting at the extremities, where the stars are seen dimly. The strips have 
a slight curvature, the concavity to E., are blackish, and quite different from the milky aurora. 
They reach now to zenith ; pulsations to E. 
Idem. 
Overcast ; pulsations to NNE. ? 
Loose, chequered cirro-cumuli to 8. (B.) 
A very faint auroral bank, 5° altitude. 25™. Aurora as before ; very faint, sky quite clear, and no 
moonlight. 
The auroral light can with difficulty be detected. 
The aurora, which has been very faint, was now broken into bundles of streamers some of them 
reaching to an altitude of 20°. 
A low indistinct arch, crown about N by W., altitude 5°; a few faint streamers to NNW., reaching 
to an altitude of 25°. 
Arch from NE by N., to NW by W., a few pencils at the eastern extremity. 
Flat arch about 7° altitude. 
Measurements of arch; extremities N. 27° E. and N. 70° W., altitude of summit 8°, centre of arch 
N. 20° W, ; afew patches within the arch. 20™, The arch has much diminished and is very faint, 
afew patches on the horizon. , 
Two arches, the upper one very faint, the lower broken and about 23° altitude; a dark space, not 
cloud, among the aurora to N. 28™, Aurora much fainter. 30™. Growing brighter, chiefly com= 
posed of broad patches which commence on the horizon and spread upwards. 
38—40. An irregular mass of light from about N. $° W. to N., where it breaks abruptly ; the mass moves 
slowly eastward ; at the termination of the light there i is a dark space, and a little farther east- 
ward a few streamers ; the light breaks up into patches, filling up the dark space ; it then swells 
out into a dense mass of light, and moves westwards, apparently pushing an intensely black patch 
before it. 
45. All broken up, a few bright patches. 51™. The moon rose about this time, and obscured the aurora, 
some streamers were seen occasionally afterwards. (W.) 
10 0. Faint streamers seen to NNW. 
Feb. 2811 0—30, The sky seems milky all over, with a slight appearance of radiation from N by E. ; it seems pro: 
bable that thisis milky aurora. There is rather more light to N. than elsew here. Cannot be s ur 
that there are any pulsations. There are dark-looking patches (of cloud?) to NW., through 
whose edges at least stars are visible. 
12 0. Evidently auroral light to N., but very faint; in fact only a little lighter than the rest of the sky, 
which is much as before ; the black patches to N. are away, at least from their previous position ; 
if clouds they were very thin. 
13 4. Cirri radiating from S by W., sky milky as before; some cirrous haze. 
14 4. Cirri with cirrous haze, cirri radiating from about 8. and N. Faint auroral light to N. 
remarked that the character of the disturbances on the nights of milky aurora has been the sam 
March. 7 14 10. Clouds cleared off from zenith, and to an altitude of 45° above NE., where the sky seems milky 
lighter than nearer the zenith ; cirro-cumulous clouds to NW. are very black, and seem lyin: 
a milky sky. Speck of light near horizon at NNW. At the edges of the clouds the sky seen 
milkier than elsewhere, or if milky in no other place, it seems milky there ; this has been frequently 
noticed before, is it merely an optical deception? (B-) 
