ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1950.tb00110.x

出版商:Blackwell Publishing Ltd    

年代:1950

数据来源: WILEY

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1950.tb00111.x

出版商:Blackwell Publishing Ltd    

年代:1950

数据来源: WILEY

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1950.tb00113.x

出版商:Blackwell Publishing Ltd    

年代:1950

数据来源: WILEY

摘要:

AbstractIn this paper are given details concerning the acquisition of an iron meteorite (siderite) found approximately 13 miles west‐southwest of Albuquerque, in Bernalillo County, New Mexico (equatorial coördinate number (ECN) = + 1068,350). The total mass recovered to date is a single specimen weighing 157.3 gm. Mineralogical, chemical, and radiochemical studies have been made, and, on the basis of these investigations, the meteorite is classified as a medium octahedrite (Om). The original belief that this meteorite might be a stray specimen of the Canyon Diablo, Arizona, fall is refuted by the mineralogical, chemical, and radiochemical findings, especially the last t

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1950.tb00114.x

出版商:Blackwell Publishing Ltd    

年代:1950

数据来源: WILEY

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1950.tb00115.x

出版商:Blackwell Publishing Ltd    

年代:1950

数据来源: WILEY

摘要:

AbstractDensity measurements of the spectrum of a Perseid meteor reveal an increase in the strength of the K line of ionized calcium with respect to the neutral iron‐magnesium blend at 3830 A., particularly during bursts. The greater strengthening of high‐excitation lines relative to low‐excitation lines during bursts appears to be fairly general thruout the spectrum. Effective‐temperature determinations, based upon the relative intensities of certain iron multiplets, however, indicate lower excitation of iron vapor during bursts than between them. The effective‐temperature difference is of the order of 20

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1950.tb00116.x

出版商:Blackwell Publishing Ltd    

年代:1950

数据来源: WILEY

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1950.tb00117.x

出版商:Blackwell Publishing Ltd    

年代:1950

数据来源: WILEY

摘要:

AbstractAn investigation has been made into the effect upon meteorites in space of the primary rays in the exceedingly strong cosmic radiation that falls upon these bodies before they penetrate the Earth's atmosphere. Specimens of meteorites with terrestrial ages (i.e., intervals since time of fall) ranging from 9 months to 457 years were studied by means of the nuclear‐emulsion‐plate technique.The oldest meteorite studied (Ensisheim, Alsace, France) was found to be inactive, and the next oldest (Pitts, Georgia) was only very slightly active. On the other hand, the relatively young Walters, Oklahoma, meteorite showed considerable activity, and a metallic inclusion and one piece of crust from the very recent Norton‐Furnas Counties, Kansas‐Nebraska, achondritic fall of 1948 February 18 were very active indeed. Another piece of Norton crust showed only slight activity, and two other fragments of this achondrite were inactive.Examination of the nuclear “stars” recorded on the emulsion plates shows that the activity observed in the specimens studied is an induced one and cannot be attributed to the low content of natural radioactive elements present in the meteorites. Tentative explanations of this induced activity are advanced i

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1950.tb00118.x

出版商:Blackwell Publishing Ltd    

年代:1950

数据来源: WILEY

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1950.tb00119.x

出版商:Blackwell Publishing Ltd    

年代:1950

数据来源: WILEY

ISSN:0096-2805    

DOI:10.1111/j.1945-5100.1950.tb00120.x

出版商:Blackwell Publishing Ltd    

年代:1950

数据来源: WILEY