Space weather near Earth and energetic particles: selected results

Space weather effects have two links to research of energetic particles in space. First, the direct one, connected with the interaction of high energy cosmic particles including galactic, solar cosmic rays, as well as magnetospheric particles, with various materials as satellite systems, atmosphere, ionosphere, airplane systems, human body at high altitudes and in space. Second one, the indirect relations, is checking the relevance of possible forecasts of space weather phenomena according to the data of energetic particles both on the ground and on the satellites and space probes. We review few selected aspects of the second type of relations with references mainly to recent studies, namely (i) progress in description of selected quasi-periodicities in cosmic ray time series which are of potential use for space weather studies, (ii) status in the forecast of geoeffective and radiation storm alerts using signatures of ground-based observations, (iii) problem of relativistic electrons in the vicinity of Earth.