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1 高空环境的特点高空环境的基本特点是:高真空、微重力和强辐射。如1988年我国发射的“8885”返地卫星的飞行高度为200～316km,在这一高度的空间环境,微重力为1.5×10~(-5)g,真空度为6.5×10~(-5)～1.3×10~(-5)Pa,电离辐射积分通量为10~(10)c/cm~2。又如1987年8月通过高空气球测到在海拔高度为30～38km 高空,大气结构为:气温243～257°k,空气密度1.971×10~(-2)～4.505×10~(-3)kg/m~(-3),压力1.322×10~1～6.519×10°P,辐射流强0.6/m~2·S。高空环境的这些特点,显然和人类及各种动植物在地球上的生存环境有着巨大差异,
The characteristics of a high altitude environment The basic characteristics of high altitude environment are: high vacuum, microgravity and strong radiation. For example, the “8885” retrospective satellite launched in 1988 in our country has a flight altitude of 200-316 km. In this highly spatial environment, the microgravity is 1.5 × 10 -5 g and the degree of vacuum is 6.5 × 10 ~ (-5) ~ 1.3 × 10 ~ (-5) Pa, and the integral flux of ionizing radiation is 10 ~ (10) c / cm ~ 2. In another example, in August 1987 measured by high-altitude balloon at an altitude of 30 ~ 38km altitude, the atmosphere structure is: temperature 243 ~ 257 ° k, air density 1.971 × 10 -2 ~ 4.505 × 10 -3, kg / m ~ (-3), pressure of 1.322 × 10 ~ 1 ~ 6.519 × 10 ° P, and radiation flux of 0.6 / m ~ 2 · S. These characteristics of the high-altitude environment apparently have great differences with the living environment of humans and all kinds of animals and plants on the earth.