Notes to the Extra Observations of Magnetometers, November 17 — December 3, 1845. 125 



NOTES ON THE AURORJE BOREALES SEEN AT MA.KERSTOUN. 



d. h. m. 



17 9 6, Bright patches and bands, forming combs, brushes, and streamers. 



7. Bright brushes and streamers to NNW. 10™. Faint streamers to N by W., occasionally bright. 

 15™. Faint streamers throughout, 



20. Altogether faint. 



55 — 59. Patches and brushes breaking out. 

 10 16. No aurora visible. 

 3 5 50. Auroral arch about 35° altitude, vivid pencils and brushes within the arch. 

 56. Very bright to NNW. 



58. Double arch, bright to NW. 



59. Like rows of spears, bright to NW. 



6 0. Vivid broken pencils or double brushes. 



1. Bright beams to NNW. from the lower arch, andwithin the upper arch the latter has an altitude of 25°. 

 4. Vivid brushes from a low arch to NW by N. 



7. Arch of short brushes about a degree in breadth. 



8. Inferior side of arch of brushes 5° altitude. 



9 — 10. Vivid green brushes to NNE., which break up the arch. 



10. The arch of brushes like a reaping-hook, the apex of the circular portion in the magnetic meridian. 



11. Brushes and patches detached, of much breadth. 



13. The arch of brushes now forms two, like the arches of a bridge, the junction of the two being in the 



magnetic meridian ; a patch of black cloud in the upper auroral arch to NE. 



14. Brush arch quite flat. 



15, Vivid green spears to NNE. 



16, Undulated arch of brushes. 



18. Vivid pencils and brushes, the most vivid to NNW; the pencils are penetrating the upper arch. 



21. Black cloud still stationary in auroral arch to NE. ; bright to NNE. 



23. Upper arch rather higher, 27° altitude. 



24. Brushes close to hoi-izon. 



25. Double row of brushes, bright in some places. 



26. Portion of an arch close to horizon to N., rising, 



27. Cloud to NE. becoming smaller, but still in the same position, 



28. Like a lake of flame to N. 



31. Cloud to NE. disappeared ; streamers vivid to NE. 



32. Low arch of brushes 4° inferior altitude, vivid pencils to NNE. 



35. Upper or permanent arch faint ; three rows of brushes, vivid to NNE. and NNW. 



36. Beautiful, undulating, and travelling masses of green brushes. 



37. Again the curve somewhat like a reaping-hook. 



39. Three piles of brushes (one above the other), bright to NW. 



40. Brushes chiefly to NW. 



41. Much fainter. 



42. Amorphous mass of light to NE., arch disappearing or falling in. 



44. Streamers above the upper ai'ch and also close to horizon. 



45. The permanent arch still visible. 



50. Aurora faint till now, vivid streamers to W., arch about 30° altitude, but faint ; black cloud to 

 NW. in the aurora. 



52. Faint. The previous observations were made within the Observatory from one of the north windows. 



53. Upper arch disappearing. As the disturbance was still considerable the observer went out of the 



Observatory to see the phenomena more completely, when he found — 



54. A broad arch through zenith, very diffuse to W., and bent from ENE, to the S. with a great bay. 

 56. An arch springing from ENE., about 10° broad, taking a large bend towards the S., and crossing 



at about 10° to the S. of the zenith; the southern edge passes within 2° of Aldebaran, touches the 

 Pleiades, the belt then stretches straight across the sky, passing through Cygnus, the northern 

 edge touching a Cygni. 



The arch moving ofi" towards the S., altitude 50° ; streamers springing from the eastern extremity. 



Arch going still farther towards the south. 



Auroral arch through zenith, faint ; bright pencils to E., en echelon. 



Vivid pencils as before to N,, with black cloud to NW. 



A series of broken arches to N., under 60° altitude ; the arch to the S. has disappeared. 



Three broken arches with the altitude of 60°. Amorphous brushes to NE. 



Brushes to NE., inclined irregularly to different points. 



CBS, 1845, 2 I 







59. 



- 



7 



0. 



8. 



18. 



20 

 21. 

 24. 



MAG. 



AND MET 



