An attempt is made to find the zodiacal cloud shape out of the ecliptic, on the basis of the Mujica et al (1980) establishment of the optical homogeneity of the medium in the ecliptic plane by means of ecliptic density and scattering functions. The consistency of the profile obtained is checked through the calculation of the brightness curves

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Solutions of the equations describing the motion of a straight horizontal magnetic flux tube in the convection zone of the sun including inertial term and radiative exchange with the surroundings are presented. Cases where the tube is initially both in thermal or in mechanical equilibrium with the surroundings are considered. It is shown that the

During the summer of 1978 the F Corona was observed from the ground in the near infrared at 2. and 3. in an attempt to measure the localized thermal emission from dust predicted by Peterson (1963) and several other workers. We failed to detect this emission even though our experimental errors were well below previously quoted emission values. If

The paper reports partially simultaneous observations of the 'rapid burster' (MXB 1730-335) at X-ray, infrared, and radio wavelengths, covering several hundred hours during 1979 and 1980. None of the authors of this report saw any infrared or radio bursts. On several occasions an absence of infrared bursting was observed during X-ray bursting. On

The chromospheric h and k emission cores of the G dwarfs and subdwarfs Beta Hyi (14), Zeta Tuc (5), Delta Pav (5), and Tau Cet (5) have been monitored over a period of four years using the IUE satellite long wavelength camera. A detailed statistical examination of the data has shown that no variation in h and k fluxes of less than 15 percent could