Observational Clues of Galactic Cosmic Rays – from X-ray Point of View

X-ray observations are the strong tool to study nonthermal phenomena in the universe. Detecting synchrotron X-rays is the direct evidence of accelerated electrons in the magnetic field, and thermal X-rays from the background plasma of the acceleration sites show us their physical parameters such as temperature, density, and so on. Recent X-ray observations show us the discrepancy of the standard model of Galactic cosmic ray acceleration in supernova remnants and pulsar wind nebulae, such as high acceleration efficiency, amplification of magnetic field on the shock, escape from the shock, and so on. In this paper, we will introduce how present X-ray observatories, and near-future X-ray observatories will, contribute the understanding Galactic cosmic ray acceleration beyond the standard model, together with radio, optical, and gamma-ray observations.