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The beam-induced conductive-mode and cathodoluminescence mode have been used in the study of GaAs and InP epitaxial layers and Gunn devices. The paper outlines the techniques used.

This paper is a short status report on the continuing development of Cu 2—xTe-CdTe thin film solar cells for eventual aerospace application. The fabrication and operating characteristics are described, as well as on-earth maintenance, stability to thermal cycling, and resistance to radiation. Experiments with single crystal junctions are used to obtain a basic understanding of the Cu2—xTe-CdTe junctions, and to guide future thin film work. The most pressing current need is to determine how to extend cell life, particularly at elevated temperatures.

The present paper considers the VLF radiation characteristics from a thin dipole antenna in a warm magnetoplasma. Formal solutions are derived for the portions of the dipole radiation resistance due to the thermal modes (Rt) and the whistler mode (Rw). In this derivation the ions are assumed to be cold, and the effects of finite electron temperatures are included by means of a scalar pressure term. Two particular orientations of the dipole are considered (parallel and perpendicular to the static magnetic field line). A detailed analysis is made for frequencies in the range between the electron gyrofrequency (fHe) and the lower-hybrid-resonance frequency (fLHR). Several numerical plots of Rt ∥, and Rw∥, are presented for typical VLF magnetospheric plasma parameters. They show that for frequencies ( f) not close to fLHR, Rt∥, is generally < 2 x 10-1 Rw∥, whereas as f → fLHR, R t , ≃ 10-1 Rw and R t∥ ≃ Rw∥. Using these numerical values of Rt∥, and Rw∥,, the dipole whistler mode radiation efficiences ηw have been estimated for a number of specific cases. In most cases ηw ≳ 70 %, but falls as low as ∼ 38 % at f ≃ f≳ LHR.