Notes to the Extra Observations of Magnetometers, December 3, 1845. 127 



NOTES ON THE AUEORJE BOREALES SEEN AT MAKERSTOUN. 



Dec. 3 14 22. Pulsating arch about 35° altitude. 23™. The lower arch falling into bright brushes ; rapid pulsa- 

 tions between the upper and lower arches. 

 26. Kapid pulsations ; row of brushes below the lower arch, altitude 5°. 



28. Continuous pulsations ; bright brush on NNW. horizon, pencils from it ; rows of brushes below the 



lowest arch. 

 31. Pulsations upwards from the arch, brushes all below, pulsating arch gone ? 



35. Bright pencils and pulsations, the former within, the latter without, the low arch. 41'". Arch fainter. 

 44. Arch formed of rapidly pulsating bands, with streamers here and there. 

 50. A continuation of the rapid flashes from the arches. 



15 10. Pulsations chiefly about 20° altitude, sometimes vivid. The arch getting lower wholly within about 



12° altitude. 

 27 — 28. Streamer to NNE., brushes, continuous pulsations. 

 30. Pulsating brushes low. 

 39. W. extremity of an arch visible ; the original arch now composed of pulsating brushes. Streaks of 



cirro-stratus to WNW. and NNW. all apparently radiating from about NNW. Rapid pulsations. 



16 4. Masses of cirro-stratus increased, middle of the masses about NNW : as if branching from that point 



(magnetic north) ; rapid pulsations ; no complete arch. 



15. Clouds separating; aurora rather increasing ; homogeneous segment with pulsations above. The 

 clouds do not seem to move away, but simply to increase or diminish in bulk, disappearing alto- 

 gether at times. (This growth and disappearance of cloud has been frequently observed during 

 exhibitions of aurora, and will be found noticed in future notes. B.) 



24. The eastern portion of clouds remaining, the rest gone, excepting a few specks to NNW. 



29. Nearly homogeneous circular segment of light, pulsations faint. 32™. Clouds gone. 

 46. Auroral light within 10° altitude at NNW. ; faint, with faint pulsations. 



The same time is employed in these Notes as in the Extra Observations of Magnetometers, namely, Gbttingen mean time, astronomical reckoning. 



