标题： 低密度波隆纳鲁瓦型流星体的出现率 显示英文标题

标题： Incidence of low-density meteoroids of the Polonnaruwa type

摘要： 微流星体的入射，其密度低于约1克/立方厘米，来自彗星，每天平均至少5吨进入地球。 尽管其中大部分在通过大气层作为流星时被烧毁，但有非微不足道的比例（约10%），其尺寸约为1米，可能以波隆纳鲁瓦型陨石的形式存在，这些陨石大多未被注意到。 显示英文摘要

摘要： The ingress of micrometeorites of cometary origin with densities below ~ 1 g cm-3 into the Earth could average at least 5 tonne per day. Although much of this is burnt upon entry through the atmosphere as meteors, a non-trivial fraction (~10%) which have sizes of ~ 1 m could end up in the form of Polonnaruwa-type meteorites that have mostly gone unnoticed.