Seventy-one occurrences of coronal mass ejections(CMEs) associated with radio bursts,seemingly associated with type Ⅲ bursts/fine structures(FSs),in the centimeter-metric frequency range during 2003-2005,were obtained with the spectrometers at the National Astronomical Observatories,Chinese Academy of Sciences(NAOC) and the Culgoora radio spectrometer and are presented.The statistical results of 68 out of 71 events associated with the radio type III bursts or FSs during the initiation or early stages of the CMEs indicate that most CMEs contain the emissions of radio type Ⅲ bursts/FSs near the time of the CME's onset,in spite of their fast or slow speeds.Therefore,we propose that type Ⅲ bursts and FSs are possible precursors of the onset of CMEs.We stress that the radio type Ⅲ bursts/FSs in the centimetermetric wavelength region and the CME transients possibly occurred in conjunction with the origin of the coronal precursor structures.Thus,the statistical results support the suggestions that type Ⅲ bursts/FSs are indicators of extra energy input into the corona at the CMEs' onset,and that the type Ⅲ bursts/FSs are produced primarily due to a coronal instability which eventually triggers the CME process.This may signify that the centimeter-metric radio bursts corresponding to or near the CME's onset are caused by the disturbed corona(possibly including minor magnetic reconnections).
The Kunming 40-meter radio telescope is situated in the yard ofthe Yunnan Astronomical Observatory(Longitude:1 02.8° East,Latitude:2 5.0° North)and saw its first light in 2006 May.The Kunming station successfully joined the VLBI tracking of China's first lunar probe "Chang'E-1" together with the other Chinese telescopes: the Beijing Miyun 50-meter radio telescope,Urumqi Nanshan 25-meter radio tele-scope,and Shanghai Sheshan 25-meter radio telescope,and received the downlinked scientific data together with the Miyun station from October of 2007 to March of 2009. We give an introduction to the new Chinese VLBI facility and investigate its potential applications.Due to its location,the Kunming station can significantly improve the u-v coverage of the European VLBI Network(EVN),in particular,in long base-line observations.We also report the results of the first EVN fringe-test experiment of N09SX1 with the Kunming station.The first fringes in the European telescopes were successfully detected at 2.3 GHz with the ftp-transferred data on 2009 June 1 7. From scheduling the observations to performing the post correlations,the Kunming station shows its good compatibility to work with the EVN.The imaging result of the extended source 11 56+295 further demonstrates that the Kunming station greatly enhances the EVN performance.
