It is argued that internal gravity waves generated by the convective envelope of a star may be effective in producing a weak mixing in its radiative interior. The spectrum of wavelengths and frequencies generated is estimated. Only the largest horizontal wavelengths and the lowest frequencies contribute significantly to the wave energy flux and the

High-speed photometric observations of the recently discovered roAp star 10 Aql were performed in the J(1.22-micrometer) filter. A total of 47.2 hours of data were obtained during seven consecutive nights in July 1990, using a standard infrared photometer attached to the Cassegrain focus of the 1.54 m Carlos Sanchez telescope at the Observatorio

A new series of observation of the Crab Nebula in TeV gamma rays using an improved camera on the Whipple Observatory 10 m Optical Reflector is reported. The smaller pixel size results in a lower energy threshold for gamma-ray detection than that reported in WEA89. The improvement in SNR compared with the original camera (Cawley et al., 1990) is a

Ionospheric modification using photochemically reactive vapors is studied with a one-dimensional, multiion, fluid model of plasma flow along magnetic field lines. The magnitudes of ion and electron density changes are determined by considering both chemical processes (i.e., photoionization, ion-molecule reactions, dissociative recombination

The evolution of supernova remnants in preexisting cavities is examined by means of 1D and 2D numerical studies of the phenomenon and the fragmentation of ejecta. The analytical approach involves approximating the cavity produced by an adiabatic blast with a power-law density distribution. The numerical studies that follow model a single supernova

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