342 Notes to the Extra Observations of Magnetometers, February 25 — September 11, 18'. | 



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NOTES ON THE AURORA BOREALES SEEN AT MAKERSTOUN. 





Gott. M. T. 





d. 



h. m. 



Feb. 



25 



9 50. 



55. 



10 0. 



10 10. 



35. 



11 40" 



12 15. 



19. 



Feb. 



26 



10 30. 



Mar. 



16 



8 55. 



9 0. 

 9 40. 



Auroral arch, upper margin passing through a Cygni. 



Auroral arch, lower margin passing through a Cygni. i 



Arch 1° higher, steady ; reaches from W by N. to NE by N. I 



Arch nearly as before ; the eastern termination is rounded like portion of a circle, but the weste 



termination, which is brightest, is sharp, starting in a nearly straight line, making an acute an;; 



with the horizon. 

 Arch much fainter, the lower edge passing through a Cygni. 

 — 50™. Bright auroral arch like ermine, about 7^ altitude ; black sky (?) within, ultimately bro 



up into several small arches with short streamers. 

 The arch is rather irregular, and consists solely of pencils. 

 Arch iri'egular, but light more homogeneous. 



Auroral light to N., with faint streamers shooting from the horizon. 

 Auroral light to N., to an altitude of 12°; partially obscured by clouds; throwing out fai 



streamers. 

 Aurora obscured by clouds. 

 An auroral belt passing through X Orionis and between Castor and Pollux ; rather nearer Cast 



than Pollux. 

 34. The belt broken into two ; probably the whole semicircle would be visible if the sky were clear, it 



seen through haze. 

 42. The arch is 4° broad, it passes south of Pollux through y Orionis and y Geminorum to 45° altitu 



from E. horizon, where it is lost behind clouds ; the arch is now single. 

 45. The arch passes between a and y Orionis, south of Pollux and through e Bootis. 50™. The ar 



has a bend towards the south between the zenith and Orion. 

 54. The arch fainter, passes through a Orionis and t Bootis, it is about 3° broad. 55™. It now pass 



about 4° to south of a Orionis, and 3° to south of e 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 wi 



certainty be called aurora. The sky throughout the evening generally covered with rather lar 



cirro-cumuli, a species of cloud which, if my memory serves, is rather common under the auspic 



of an increasing or nearly full moon (B.) 

 13 8. Faint auroral light to NW. 1 the clouds have moved off in that quarter, the sky merely looks mil 



there however. 

 There is no doubt that there is a faint aurora. 

 Faint auroral light to N. ; it has appeared the same for some time, and no streamers have bet 



observed. 

 Sky becoming overcast; light still seen to N. 13^ 35™. Sky overcast. 

 Diffuse auroral light with occasional faint streamers. 20™. Faint streamers to NW. 

 Diffuse, faint auroral light seen among the clouds ; a faint broad beam to W by S., stretching t 



wards the zenith ; much obscured by clouds. 

 25. Streamer rises from W by S., pointing south of zenith, another streamer is connected with it 



about 15° altitude, the latter passes through the zenith. Auroral patches to N. 

 40. Streamer to W by S., narrow and distinct, making an angle of about 10° or 15° with the circ 



thi'ough the zenith and W by S. 

 45. The origin of the streamer has moved further south on the horizon, but it is now very fail 



Auroral bank to N., altitude about 10°. Cloudy to E., S., and N. Sky chiefly from N. to ^ 



and to SW. 

 11 10. An auroral arch or bank, rather patchy and in-egular ; occasionally short dumpy streamers. 15 



Arch pulsating. 20™. Only the NW. quadrant visible, continuous and rapid pulsation as hiji 



as Ursa Major. I 



Patches disappeared, to a considerable extent. 26™. Patches reappeared but not so bright as befoij 

 Faint streamers from NW. horizon. 39™. Streamers bright. j 



Brightest streamer to WNW. 45™. Much fainter. 55™. Aurora nearly disappeared. Sky ^ 



coming overcast. ' 



Slight magnetic irregularities ; aurora looked for, but none visible. 

 Faint auroral arch about 7° altitude. 

 Auroral beam 2° broad, rising to an altitude of 20° from W by S. ; the rest of the aurora very fair 



45™. Beam still continues, but fainter and shorter. 50™. Aurora very faint; the beam has di 



appeared. 





18. 



April 16 



10 45. 





11 35. 



Aug. 24 



11 15. 



Aug. 27 



10 15. 









23. 









36. 









41. 



Aug. 



29 



10 



25. 



Sept. 



10 



9 



40. 



Sept. 



11 



10 



34. 



