The abundances of long-lived radioactive elements Th and U observed in metal-poor halo stars can be used as chronometers to determine the age of individual star
A rare Type I-like noise storm was observed with the solar radio spectrometers (1.0-2.0 GHz and 2.60-3.8 GHz) at National Astronomical Observatories of China (N
Based on previous work, we investigate the propagation of CMEs in amore realistic plasma environment than the isothermal atmosphere, and find thatMach number MA