<正>Two impulsive microwave bursts observed by Owens-Valley Solar Arrays (OVSA)are studied.The fast time variation of the turnover frequency in these bursts is
It is of great importance to study pulsar beam shape if we are concerned with emission theories and pulsar birth rate.Both observations and the ICS model show t
We examine the nonlinear dynamical properties of the monthly smoothed group sunspot number Rg and find that the solar activity underlying the time series of Rg