Department of Transportation Air Traffic Control Advisory Committee, 1968-1969

The Department of Transportation Air Traffic Control Advisory Committee concentrated on control of aircraft through the airspace, from takeoff to landing. Emphasis was placed on major terminal areas and on the denser portions of the enroute airspace where the need for efficient use of scarce resources (principally runways and terminal airspace) and the danger of mid-air collisions make sophisticated air traffic control mandatory if safety is to be assured without sacrifice of capacity. Airports were included in the study insofar as they strongly interact with air traffic control, and then, primarily, the committee's concern was with efficient use of runways. No work was done on airport access. Considerable effort was placed on the subject of noise reduction which may be critical to community acceptance of high-capacity airports.     

Orbital dynamics of magnetospherically trapped lunar ejecta

$\text{In situ}$ measurements by dust experiments on HEOS II showed significant enhancement of fluxes for submicron particles. Recent studies have shown that lunar ejecta in this size range can, in a highly simplified model, be trapped in the earth's magnetosphere. The present work is a more detailed study of the dynamics of lunar ejecta in the magnetosphere. The particle size ranges for which the guiding center approximation is valid, for which corotation is negligible, and for which electromagnetic forces dominate gravitational forces have been calculated. Temporal details of charge acquisition by ejecta in the plasmasphere are considered.     

Professional environment for knowledge workers: educators'responsibilities

It is argued that educators possess the potential for having the greatest impact on developing a knowledge worker's professional identity and that because of this they must also bear the greatest responsibility for this development. They can impact the students directly by presenting seminars with professionally related content, by incorporating such topics into their classroom lectures, and by serving as appropriate role models. Educators can also assist, indirectly, by supporting an encouraging membership and active participation in the local IEEE Student Branch     

A capacitor impact sensor (CIS) on board Giotto for detection of cometary dust particles

A low power high reliability impact sensor based on the discharge of a parallel plate capacitor is described. The choice of a surface area of about 1000 cm² and a penetration thickness of 50 micrometers will provide data on the flux density of cometary dust particles in the 5 micrometers diameter range (10⁻¹⁰g). A high noise immunity promotes excellent reliability under conditions of heavy spacecraft bombardment and high plasma densities in the late stages of the 500 km approach distance. Self-limiting of the event rate compression system also provides flux data at arbitrarily high impact rates. The capacitor sensor will be located on the external face of the outer dust shield of Giotto Spacecraft and it will be a part of the DIDSY experiment.     

Ion Composition of the Earth’s Radiation Belts in the Range from 100 keV to $100\mbox{ MeV}/\mbox{nucleon}$: Fifty Years of Research

Spatial, energy and angular distributions of ion fluxes in the Earth’s radiation belts (ERB) near the equatorial plane, at middle geomagnetic latitudes and at low altitudes are systematically reviewed herein. Distributions of all main ion components, from protons to Fe (including hydrogen and helium isotopes), and their variations under the action of solar and geomagnetic activity are considered. For ions with \(Z\geq 2\) and especially for ions with \(Z \geq 9\), these variations are much more than for protons, and these have no direct connection with the intensity of magnetic storms (\(Z\) is the charge of the atomic nucleus with respect to the charge of the proton). The main physical mechanisms for the generation of ion fluxes in the ERB and the losses of these ions are considered. Solar wind, Solar Cosmic Rays (SCR), Galactic Cosmic Rays (GCR), and Anomalous component of Cosmic Rays (ACR) as sources of ions in the ERB are considered.