Magnetic reconnection is a fundamental plasma process where topology of the magnetic field changes and transfer of magnetic energy into kinetic and thermal energy takes place. This study obtained characteristic parameters that describes the temporal evolution and spatial structure of the magnetic reconnection in space, based on detailed analysis of data from satellites orbiting in the Earth's space. Although the large-scale effects of magnetic reconnection have been known for a long time, how and where the reconnection take place in still a debating issue. This is due to the fact that reconnection undergoes in a very thin electric current sheet, down to a couple of km. The region, where ions are moving independent of the magnetic field, is called the ion diffusion region. Plasma processes related to the reconnection ion diffusion region are the main theme of this project. The key question is: How does the ion diffusion region changes in time and space? To answer the question different analysis methods are applied to data from two recent multi-spacecraft missions, Cluster and THEMIS. From statistical studies as well as detail event studies we obtain the propagation speed and direction of the reconnection region. Furthermore, spatial scales of the reconnection region are estimated from remote signatures of reconnection. Effects of these signatures on the ambient magnetic field and plasma are also inferred. Magnetic reconnection plays a key role not only in the Earth's magnetosphere but also in different planet in our solar system and beyond. It is also relevant to the space weather, which is the environmental condition in magnetosphere, thermosphere, and ionosphere caused by the sun. In particular, the obtained results contribute to improve our understanding the large scale magnetospheric disturbances called substorms and storms, which are important space weather phenomena.