The 1999 ozone hole still covers most of Antarctica but total ozone values are now rising. The outer margins of the hole currently form a rough ellipse aligned towards the Indian Ocean. There are high ozone values over Wilkes Land. Total ozone values at Vernadsky briefly rose above 300 DU on October 7, before dropping back to 140 DU in mid October.
Stratospheric temperatures remain cold enough for stratospheric clouds to exist.
Mean total ozone values at Halley fell from around 220 DU in late August to around 150 DU in mid September, then rose briefly to reach 200 DU on September 23 rd when planetary wave activity brought the edge of the ozone hole close to the station. This is the highest ozone amount at the station in the last 10 days of September since 1990. Measurements made at the start of the season are of lower accuracy than in mid summer due to the low solar elevation or use of moonlight. Gif images showing the data are available on the BAS ozone web-page. Data from Halley show that the mean 100 hPa temperature is slowly rising, though it remains near -80 deg C, which is seven deg C below the normal for the time of year.