流星暴的航天定义

Astronautic Definition of Meteor Storm

定义ZHR以每小时穿过1000平方公里天顶截面的,能在铝质表面打出直径不小于1厘米的弹坑的流星体数,作为流星群对航天安全威胁强度的定量标志,给出了从ZHR到ZHR的换算公式.用ZHR取代ZHR来评价20世纪90年代以来的一些强流星雨,发现1998年的贾可比尼(天龙座)流星雨对航天安全来说,是比公认的1999、2001、2002年3次狮子座流星暴强数倍的更强流星暴.

ZHR* is defined as the number of meteoroids passing 1000km2 zenith area per hour which can form craters no less than 1 cm in diameter on a aluminum surface. The relationship between ZHR and ZHR* is deduced. To evaluate the strong meteor showers since 1990s by ZHR* instead of ZHR, it is found the Giacobinids (Draconids) in 1998 is much stronger than the Leonids in 1999, 2001 and 2002 for spaceflight security.