Simultaneous ground based millimeter-wave soundings of stratospheric ozone in Apatity (67°N, 35°E) and Nizhny Novgorod (56°N, 44°E) during the winter 1999/2000

The necessity of synchronous microwave observations of ozone behaviour on altitudes from 20 up to 60 km in polar and mid-latitude is caused by steady drop (in 90-ths of former century) its content in stratosphere of Northern Hemisphere. The largest declination of ozone happens on level about 19-20 km (potential temperature 465 K) in March in region covered latitude higher 60N. In this work the results of simultaneous microwave observations of stratospheric ozone in middle and polar latitude during the winter and spring 1999/2000 performed on SOLVE program are presented. The SAGE-III Ozone Loss and Validation Experiment (SOLVE) is a measurement campaign designed to examine the processes which control polar to mid-latitude stratospheric ozone levels