◆ SpookStack

Incident: 227 of these meteor showers norvally produce extremly bright green fireb-lls such as thooe recently obeerved. For example, the observation mentioned by Mr Monnig (Inciient 231) appe-red near the maximum of the Quadrantid showr of early January, Mr McOullough's observation of August wos mear the tim of the Persid shower (Incident 230) and the December observations (223, 2c3e 22%, 227, &2% fell in the interval covered by the Gewinid shower. Pais welablonshle t indicate an attempt to render the green fireballs less by cms them to appear only when there is considerable meteoric activity. he As noted in ap earlier commnic«tiom the remarlably vivid green color renorted for west of the December fireballs is rarely observed in the case of gemine meteors, By laboratory test thie peouliar color seems to ve identical with tat given off by copper salts in the blowpipé flame. If this identification is correct, tne vavelengt: of the radiation from the green fireballs io near pe R218 A. i. The duration eetimates of be'veen 2 and 3 seconds reported for the green firebdalle are considerably longer than those (0.4 - 0.5 seconds) for the ordinary vieual meteors, but shorter than the dmmation estimates invar- fably reported in the cave of a gomuine meteorite fll (5 t6 30 seconin or even longer). j- Home of the green fireballs seem to have a train of sparks or a dust cloud following. This contrarts sharply with the behavior noted in case of meteoric firebalie - pertioularly tiose thst penetrate to the very low levels where the green fireball of December 12 wis observed. MOTE: Inquiry at Holloman AF Base, Alamagordo, N. K., revealed that research work et night and om Supdays does ndt involve the use of any lighting device or flares suth ac described in the various reports subsitted.