This handbook is a comprehensive collection of data, formulas, definitions, and theories concerning the natural environment. It was written by scientists of the Air Force Cambridge Research Laboratories (AFCRL) which, in 1976, became the Air Force Geophysics Laboratory (AFGL). It was designed to serve a broad spectrum of users: the planner, designer, developer, and operator of aerospace systems; the scientist who will find the tables and figures a convenient reference in his own field; the specialist who needs environmental data in another discipline; and science minded people who seek a summary of space-age environmental research. Revisions of individual chapters and sections of this handbook will be published as additional environmental research efforts pay off in new knowledge.

This paper is an outgrowth of comments I heard and attitudes I experienced at the JFCOM Joint Space Concept Development and Experimentation Workshop in Norfolk at the end of March 2004. I presented a briefing on near-space at the conference along with colleagues from JFCOM, the Army Space and Missile Defense Battlelab, the Naval Research Laboratory, and the Navy Warfare Development Command. It discussed how many functions that are currently done with satellites could be performed for tactical and operational commanders using near-space assets much more cheaply and with much greater operational utility. The briefing was very well received with nothing but positive comments all around. However, once we broke into focus groups trying to develop exercise inputs for such subjects as operationally responsive space, the near-space concept was almost forgotten. It didn't fit into the normal mindset of what space meant, so it was difficult to convince other group members that it should be discussed in the same breath as, say, a TacSat-type program. After much thought, it was my perception that the problem was one of mindset as to what the word "space" meant to the warfighter. After reading space doctrine (Army, Navy, Air Force, and Joint), I discovered that the mindset I sensed at the workshop had actually been codified to define space as a place where we operate satellites. That mindset is counterproductive.

The breakup of the Space Shuttle Columbia as it reentered Earth's atmosphere on February 1, 2003, reminded the public--and NASA--of the grave risks posed to spacecraft by everything from insulating foam to space debris. Here, Alan Tribble presents a singular, up-to-date account of a wide range of less conspicuous but no less consequential environmental effects that can damage or cause poor performance of orbiting spacecraft. Conveying a wealth of insight into the nature of the space environment and how spacecraft interact with it, he covers design modifications aimed at eliminating or reducing such environmental effects as solar absorptance increases caused by self-contamination, materials erosion by atomic oxygen, electrical discharges due to spacecraft charging, degradation of electrical circuits by radiation, and bombardment by micrometeorites. This book is unique in that it bridges the gap between studies of the space environment as performed by space physicists and spacecraft design engineering as practiced by aerospace engineers.