Search

An empirical model for energetic solar proton fluxes is presented. With this model the effects of such protons on geocentric space missions, to be flown during the next solar active period (1977-1983), and with orbits involving partial magnetospheric shielding, may be estimated. A synoptic background review is given, followed by a detailed discussion of the model's use, errors, uncertainties, and limitations, including sample calculations which demonstrate the application of specific or general project missions. Finally, for circular trajectories, percentage exposure maps are presented, depicting fractional mission times spent outside particular L shells as functions of orbit altitude and inclination. The distinguishing assumptions of this analysis are: 1) that the solar proton flux in the 10-100 MeV energy range, as accumulated over solar cycle 20 due to several discrete events, will be accumulated at a uniform rate for the seven active years of solar cycle 21; and 2) that all protons in the energy range of interest have a common geomagnetic latitude cutoff.

Stassinopoulos Michel. La nouvelle loi hellénique sur le statut des fonctionnaires. In: Revue internationale de droit comparé. Vol. 4 N°3, Juillet-septembre 1952. pp. 479-486.

SOME years ago we showed1 that the melting points of molecular layers spread over solid surfaces are lower than the melting points of the bulk substances. The melting point may be lower by as much as 30° C and depends on the nature of the substance, the number of molecular layers spread over the solid surface and the nature of the solid support. Monolayers show maximum lowering, while after a coverage of four to ten layers the melting points reach their bulk values. This phenomenon is a general property of all substances.