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Since the summer of 1996, scientists fromChina and Japan have conducted a joint observation of natural cloud-to-groundlightning discharges in the Zhongchuan area that is located close toQinghai-Xizang (Tibet) Plateau, China. It has been found that the long-durationof intracloud discharge processes, just before the first return stroke, lastedmore than 120 ms for 85% of cloud-to-ground flashes in this area, with a meanduration of 189.7 ms and a maximum of 300 ms. We present the results of chargesources neutralized by four ground flashes and two intracloud dischargeprocesses, just before the first return stroke, by using the data from a 5-siteslow antenna network synchronized by GPS with 1 µs time resolution. The resultshows that the altitudes of the neutralized negative charge for three negativeground flashes were between 2.7 to 5.4 km above the ground, while that ofneutralized positive charges for one positive ground flash and one continuingcurrent process were at about 2.0 km above the ground. The comparison with radarecho showed that the negative discharges initiated in the region greater than 20dBZ or near the edge of the region with intense echoes greater than 40 dBZ,while positive discharge initiated in the weak echo region.  <b>Key words: </b>Meterology and atmospheric dynamics(atmospheric electricity; convective processes; lightning)</p><p style="line-height: 20px;">&nbsp

Charge analysis on lightning discharges to the ground in Chinese inland plateau (close to Tibet)