Statistics and Analysis on the Relation Between Microwave Type Ⅲ Bursts and CME Events

The microwave type Ⅲ bursts and the CME are statistically analysed in the present article.The observational data were recorded with the 2.6-3.8 GHz spectrograph at the National Observations during the ascending branch of the 23rd solar cycle.It is found that microwave type Ⅲ bursts may be indications of the ejection of coronal matter.The author holds that in the events where CME and type Ⅲ bursts coexist, those in which type Ⅲ bursts occur before CME may be caused by the production of high energy electrons before the CME shock waves and when the shock waves get to the open magnetic field lines, the(3R)radio bursts start.Type Ⅱ bursts are also produced by the accelerated electronic streams and both of type Ⅱ and Ⅲ bursts all have relation to high energy electrons.The electronic streams are accelerated in the shock front and then propagate in the upward and downward regions where they excite the Langmuir waves and then change into radio waves.In a word, the activities occured before the ejection may be incentive to CME while Hαflares may be caused by the magnetic field reconnection after the ejection.In addition, all the types, intensities and positions of the correlaed activities before and after the beginning of ejection will have a great change, showing that these activities occured in the different periods of the ejection may have different physical mechanisms