342 Notes To THE Exrra OpsERVATIONS OF MAGNETOMETERS, FEBRUARY 25—SuEPTEMBER 11, 1845. 
NOTES ON THE AURORA BOREALES SEEN AT MAKERSTOUN. 
Gott. M. T. 
dh m. 
Feb. 25 9 50. Auroral arch, upper margin passing through a Cygni. 
55. Auroral arch, lower margin passing through a Cygni. 
10 0. Arch 1° higher, steady ; reaches from W by N. to NE by N. 
10 10. Arch nearly as before ; the eastern termination is rounded like portion of a circle, but the western 
termination, which is brightest, is sharp, starting in a nearly straight line, making an acute angle 
with the horizon. 
35. Arch much fainter, the lower edge passing through « Cygni. 
11 40™—50™. Bright auroral arch like ermine, about 7° altitude ; black sky (?) within, ultimately broke 
up into several small arches with short streamers. 
12 15, The arch is rather irregular, and consists solely of pencils. 
19. Arch irregular, but light more homogeneous. 
Feb. 26 10 30. Auroral light to N., with faint streamers shooting from the horizon. 
Mar. 16 8 55. Auroral light to N., to an altitude of 12°; partially obscured by clouds; throwing out faint 
streamers. . 
9 0. Aurora obscured by clouds. 
9 40. An auroral belt passing through 4 Orionis and between Castor and Pollux ; rather nearer Castor 
than Pollux. 
34. The belt broken into two ; probably the whole semicircle would be visible if the sky were clear, it is 
seen through haze. 
42. The arch is 4° broad, it passes south of Pollux through y Orionis and y Geminorum to 45° altitude 
from E, horizon, where it is lost behind clouds ; the arch is now single. 
45. The arch passes between « and y Orionis, south of Pollux and through ¢ Bootis. 50™. The arch 
has a bend towards the south between the zenith and Orion. 
54. The arch fainter, passes through « Orionis and ¢ Bootis, it is about 3° broad. 55™. It now passes 
about 4° to south of « Orionis, and 3° to south of ¢ Bootis. 
10 3. Arch disappearing about the zenith. 10™, Arch still visible but very faint. 15™, Arch gone. 
11 35. Auroral light seen throughout the night above the clouds on the N. horizon. 
April 6 11 40. The sky has been somewhat milky to N., but owing to the moonlight and clouds it could not with 
certainty be called aurora, The sky throughout the evening generally covered with rather large 
cirro-cumuli, a species of cloud which, if my memory serves, is rather common under the auspices 
of an increasing or nearly full moon (B.) 
13. 8, Faint auroral light to NW. ? the clouds have moved off in that quarter, the sky merely looks milky 
there however. 
18. There is no doubt that there is a faint aurora, 
April 16 10 45. Faint auroral light to N.; it has appeared the same for some time, and no streamers have been 
observed. 
11 35. Sky becoming overcast ; light still seen to N. 13 35™, Sky overcast. 
Aug. 24 11 15. Diffuse auroral light with occasional faint streamers. 20™, Faint streamers to NW. 
Aug. 27 10 15. Diffuse, faint auroral light seen among the clouds; a faint broad beam to W by S., stretching to- 
wards the zenith; much obscured by clouds. 
25. Streamer rises from W by S., pointing south of zenith, another streamer is connected with it at 
about 15° altitude, the latter passes through the zenith. Auroral patches to N. 
40. Streamer to W by §., narrow and distinct, making an angle of about 10° or 15° with the circle 
through the zenith and W by 8S. 
45, The origin of the streamer has moved further south on the horizon, but it is now very faint. 
Auroral bank to N., altitude about 10°. Cloudy to E., 8., and N. Sky chiefly from N. to W. 
and to SW, 
11 10. An auroral arch or bank, rather patchy and irregular ; occasionally short dumpystreamers. 15™. 
Arch pulsating. 20™, Only the NW. quadrant visible, continuous and rapid pulsation as high 
as Ursa Major. 
23. Patches disappeared, to a considerable extent. 26™. Patches reappeared but not so bright as before. 
36. Faint streamers from NW. horizon. 39™. Streamers bright. 
41. Brightest streamer to WNW. 45™. Much fainter. 655™, Aurora nearly disappeared. Sky be- 
coming overcast. 
Aug. 29 10 25. Slight magnetic irregularities ; aurora looked for, but none visible. 
Sept. 10 9 40. Faint auroral arch about 7° altitude. 
Sept. 11 10 34. Auroral beam 2° broad, rising to an altitude of 20° from W by S.; the rest of the aurora very faint. 
45™, Beam still continues, but fainter and shorter. 50™. Aurora very faint; the beam has dis- 
appeared. 
