SOLAR DISTURBANCES DURING DECEMBER, 1Q14 



By FRANK C. DENNETT. 



NoT\%aTHSTANDixG the poor meteorological conditions which 

 prevailed during the month, only three days (December 6th, 

 11th, and 28th) passed on which no telescopic examination 

 was made, and the Sun appears never to have been free 

 from spot disturbance. The longitude of the central 

 meridian was 139' 28' at noon on December 1st. 



Nos. 43 and 44 of the No^^embe^ list were visible until 

 December 9th and 10th respectively, and therefore reappear 

 upon the present chart. 



No. 43a. — A group of pores, which broke out on 

 December 2nd in front of No. 43, and continued until the 



on the 21st and 22nd, and one was situated a little to its 

 south-west on the 23rd. The spot was last seen on the 24th. 



A pore, not measured, but estimated to be in the position 

 shown by a tiny cross, near longitude 134°, S. latitude 22°, 

 was only visible on the 24th. 



No. 4S.-^-A faculic disturbance was seen coming round the 

 south-eastern limb on December 24th, and on the 25th was 

 found to be connected with a spot nine thousand miles in 

 diameter, which was last seen by the writer on January- 2nd. 



No. 49. — Two pores, only observed on December 31st, 

 separated by some fiftv thousand miles. 



DAY OF DECEMBER, 1914. 



OnjDi04050607D 



% lOO 110 IM 130 »0 ISO 160 170 



190 iOO 30 SO IX no 250 »0 270 JU 2X1 >» m »0 no 340 iSO M 



5th. Its greatest length, on the 3rd, was seventy-two 

 thousand miles. 



No. 45. — A group first seen as two considerable spots 

 just round the limb on the 3rd. The eastern spot was the 

 largest, with three or four umbrae. Some pores helped to 

 make up the group on the 8th. The length of the group was 

 sixty-four thousand miles, and the greatest diameter 

 of the spot eleven thousand miles. It was last seen on the 

 14th, when it appeared as a group of five pores in a facuUc 

 disturbance. 



No. 46. — A fine group, which was found to have broken 

 out on the 12th, consisted of two considerable spots about 

 ten thousand miles in diameter, with some pores between 

 them, fifty-six thousand miles in length. It was last seen 

 near the hmb on the 19th. 



No. 47. — A spot ten thousand miles in diameter, first seen 

 on the 18th a little within the limb. Two pores followed it 



Faculic disturbances were near the north-western limb 

 on December 1st (215°, 19° N.), 5th (160°, 16° N.), 14th, 

 24th (274°, 19° N.), 26th, 27th (216°, 20° N., and 204°, 

 18° N.), and 29th ; north-east on December 1st (75°, 

 24° N.), 16th, 27th (86°, 13° N.), and 31st; south-west 

 on December 5th, 16th (21°, 25° S.), 20th (320°, 15° S.), 

 and 29th ; south-east on December 8th (in which No. 46 

 afterwards developed), 23rd, 27th (south of No. 48, and 

 96°, 27° S.), and 29th (52°, 14° S.). 



Our chart is constructed from the joint observations of 

 Messrs. John McHarg, A. A. Buss, and the writer. 



A second chart is also appended, showng the distribution 

 of the whole of the spot disturbances of the past year. As 

 compared with pre\-ious year-charts, it will be noticed that 

 the spots, as a whole, are much farther from the Equator, 

 are more numerous than in the three previous years, and 

 are more evenly distributed. 



DISTRIBUTION OF SPOT DISTURBANCES DURING 1914. 



10 20 30 «l 50 60 TO 80 90 wo 110 120 1» HO 150 160 m m 190 MO 110 UO tX ViO 250 !60 270 280 »0 300 3(0 J20 SW M 350 560, 



B 43 



