Spurious sidereal daily variation of cosmic rays produced from stationary anisotropy of solar origin
Spurious sidereal daily variation of cosmic rays produced from stationary anisotropy of solar origin
复制标题
太阳起源的稳态各向异性产生的宇宙射线的虚假恒星日变化
DOI：
10.1007/bf02561451
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
S. Matsuzaki
中科院分区：
文献类型：
--
作者：
K. Nagashima;R. Tatsuoka;S. Matsuzaki
由于黄道的倾角，宇宙射线恒星日变化可以从太阳起源的某些固定宇宙射线各向异性中产生。例如，由宇宙射线径向密度梯度产生的扇形结构相关的恒星日变化，以及由导致太阳半日变化的双向各向异性产生的南北不对称的恒星日变化，都属于这一类。由于倾角的关系，这些日变化在恒星时间中表现出18小时或6小时的特征相位，这取决于前者的扇形结构类型（朝向或远离）或后者的观测地点（北半球或南半球）。然而，值得注意的是，上述特征相位只是近似值，如果我们考虑太阳赤道面对黄道面的倾角对这些变化的影响，根据变化的种类，特征相位滞后约0.5至0.7小时。本文提供了这些变化的精确表示，以便从观测到的恒星变化中消除它们，从而获得宇宙射线的星系各向异性。
Cosmic-ray sidereal daily variations can be produced from some kinds of stationary cosmic-ray anisotropy of solar origin, due to the obliquity of the ecliptic. For example, the sector-structure-dependent sidereal diurnal variation produced from the cosmic-ray radial density gradient and the North-South asymmetric sidereal diurnal variation produced from the bidirectional anisotropy responsible for the solar semi-diurnal variation belong to this category. Owing to the obliquity, these diurnal variations show the characteristic eigenphase of 18 h or 6 h in sidereal time, depending on the kind of the sector structure (toward or away) for the former or on the observation site (northern or southern hemisphere) for the latter. It is noted, however, that the above eigenphase is only approximate and, if we consider the effect of the inclination of the solar equatorial plane against the ecliptic plane on these variations, the eigenphase lags by about 0.5 to 0.7 h, depending on the kind of the variation. The present paper provides the exact representation of these variations, for the use of eliminating them from the observed sidereal variation in order to obtain the galactic anisotropy of cosmic rays.