An apparent effect of galactic rotation on the intensity of cosmic rays
An apparent effect of galactic rotation on the intensity of cosmic rays
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DOI：
10.1103/physrev.47.817
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发表时间：
1935-06-01
期刊：
影响因子：
--
通讯作者：
Getting, IA
中科院分区：
文献类型：
--
作者：
Compton, AH;Getting, IA
对球状星团和银河系外星云的多普勒效应研究表明，地球的运动速度约为300公里/秒。向北纬47度，赤Ascension 20小时40分方向，这主要是由于星系的旋转。计算表明，由于这种运动，在未磁化的地球上，海平面上宇宙射线的强度在正面比背面大1.2%。考虑到地球的磁场，据估计（假设到达地球的宇宙射线由质子和电子组成），由于这种运动，纬度45处的日变化应在2倍之内，等于0.1%，其最大值在恒星时20小时40分。Hess和Steinmaurer发表的数据显示恒星时的变化正好具有这种振幅和相位。虽然这种一致性给出了一个强有力的假设，即这种恒星时间变化的原因是地球在空间中的运动，但也考虑了另一种可能的解释。概述了确定性试验的实验方法。银河系旋转效应的含义是宇宙射线起源于我们的银河系之外。
Doppler effect studies of the globular clusters and the extra galactic nebulae have shown a motion of the earth of about 300 km/sec. toward about declination 47 N and right ascension 20 hr. 40 min., which is due chiefly to the rotation of the galaxy. Calculation shows that because of this motion the intensity of cosmic rays at sea level on an unmagnetized earth should be about 1.2 percent greater on the front side than on the back. Taking into account the earth's magnetic field, it is estimated (assuming the cosmic rays reaching the earth to consist of protons and electrons) that the diurnal variation at latitude 45 due to this motion should be, within a factor of 2, equal to 0.1 percent, with its maximum at 20 hr. 40 min. sidereal time. Data published by Hess and Steinmaurer show a sidereal time variation having just this amplitude and phase. While this agreement gives a strong presumption that the cause of this sidereal time variation is the earth's motion through space, another possible explanation is also considered. Experimental methods for making a definite test are outlined. The implication of a galactic rotation effect would be that the cosmic rays originate beyond our galaxy.