We report the results of optical spectroscopic monitoring observations of a T Tauri star, V409 Tau. A previous photometric study indicated that this star experi
We have studied the width and speed of coronal mass ejections (CMEs) and geomagnetic disturbance storm time (Dst) Index during ascending phase of solar cycles 2
According to general relativity the geometry of space depends on the distribution of matter or energy fields. The relation between the local geometrical paramet