This book is an introduction to the use of the ultraviolet for remote sensing of the Earth's atmosphere. It covers the Earth's UV radiative environment, experimental techniques, and current applications. it is my intention to provide the information needed to ''make a first approximation'' concerning the use of the ultraviolet and to provide access through the literature for a more thorough study. * Contains recent UV applications not previously available in book form such as ozone, auroral images, and ionospheric sensing * Features broad coverage of fundamentals of atmospheric geophysics with values for fluxes, cross-sections, and radiances * Covers techniques that illustrate principles of measurements with typical values * Contains numerous references to original literature