By Guy P. Brasseur, Susan Solomon
The reader can be stunned to profit that the note "aeronomy" isn't present in a few of the ordinary dictionaries of the English language (for examination ple. Webster's foreign dictionary). but the time period would seem to exist, as evidenced by means of the affiliations of the 2 authors of this quantity (Institut d'Aeronomie, Brussels, Belgium; Aeronomy Laboratory, nationwide Oceanic and Atmospheric management, Boulder, CO, USA). possibly a part of this obscu rity arises simply because aeronomy is a comparatively new and evolving box of pastime, with a heritage courting again no farther than approximately 1940. The Chambers dic tionary of technological know-how and know-how presents the next definition: "aeronomy (Meteor. ). The department of technology facing the ambience of the Earth and the opposite planets just about their chemical com place, actual houses, relative motion,
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Additional info for Aeronomy of the Middle Atmosphere: Chemistry and Physics of the Stratosphere and Mesosphere
This simple relationship can be used to characterize the vertical structure oC the atmosphere in a convenient form. 17b) p(z) ~ poexp [ - z - z and z- z ] n(z) ~ noexp [ - The atmospheric scale height is roughly 7 ± I km in the homosphere. This represents the altitude which corresponds to a reduction by I/e in the pressure or the concentration. The distribution of any atmospheric constituent can also be characterized by its concentration, nj(z), or its scale height, H1(z). When the scale height is equal to the atmospheric scale height, H(z), the constituent is well mixed and its mole fraction C1 = nJntotoJ is constant with altitude.
29) (see, e. , Castellan, 1971). where fp is the potential energy of the particle at point x,y,z, and where do- is the number of particles per cubic centimeter at the position x,y,z which have speeds from c to c +dc, and m is the particle mass. The exponential term accounts for both the kinetic and potential energies of the particle. For a given potential energy, the kinetic energy distribution depends only on T. Given the form of this expression and the reaction barrier discussed above, it is not surprising that the experimentally derived kinetic rate expression for many processes is: ACTIVATED COMPLEX ~ a:: LLJ Z LLJ PRODUCTS REACTION CO-ORDINATE Fig.
5 involves crossing into the repulsive snu state leading to dissociation. Nitric oxide photolysis in the middle atmosphere occurs largely through predissociation. Polyatomic molecules have more complex potential surfaces in three or more degrees of freedom, and an increased probability of possible predissociating surfaces. 6 Excited species in the middle atmosphere Photolysis reactions produce a number of electronically excited species which play an important role in the middle atmosphere. Some of these constituents are important because they are very reactive and can initiate chains of important free radical chemistry.
Aeronomy of the Middle Atmosphere: Chemistry and Physics of the Stratosphere and Mesosphere by Guy P. Brasseur, Susan Solomon