Votes and proceedings of the General Assembly of the state of New-Jersey . rther than dissociation of molecules, with at leasthalf the oxygen atoms produced being energised into anexcited state. There is increasing ionisation at higheraltitudes, and greater numbers of free electrons, so thatthe whole region above the stratosphere is also known asthe ionosphere, subdivided into three layers (D, E and F)defined by the degree of concentration of free structure of the ionosphere varies according to theinput of energy from the Sun, and is powerfully affectedby the roughly 11-year cycl
Votes and proceedings of the General Assembly of the state of New-Jersey . rther than dissociation of molecules, with at leasthalf the oxygen atoms produced being energised into anexcited state. There is increasing ionisation at higheraltitudes, and greater numbers of free electrons, so thatthe whole region above the stratosphere is also known asthe ionosphere, subdivided into three layers (D, E and F)defined by the degree of concentration of free structure of the ionosphere varies according to theinput of energy from the Sun, and is powerfully affectedby the roughly 11-year cycle of solar activity. In a sense, the top of the thermosphere is at thetemperature of interplanetary space, 1000C or more, barat such low densities the concept of temperature is nolonger very useful. By about 500 km the atmosphere isso tenuous that collisions between its component moleculesand atoms are so rare that it is meaningless to regard it as New Scientist 2 Octobei 197; FLUOROCARBON RLE Figure 5. Average globaldistributions of total ozone t>mtiliatmosphere-cm). a continuous gas, and this is the point above which thecomponents can leak away into space (the exosphere). Atsuch altitudes, magnetic effects become more important forthe ionised gases (or plasma), and the region where theyinteract with the Earths magnetic field to form the radia-tion belts and magnetosphere forms the outer boundary ofthe atmosphere for all practical purposes. Although the ozone layer is of particular importance toland-based life on the Earth, it is only one part of an atmos-phere in which many components are balanced. Ozone isconstantly being produced and destroyed by the inter-actions involving sunlight, and it is misleading to think of it as a finite resource, like oil, which can be destroyed onceand for all. What could happen is that the balance of theset of equilibrium reactions which maintain the layer maybe shifted, either in favour of less ozone or in favour ofmore (which could be equa
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