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Acknowledgements:

The United States National Science FoundationÕs Polar Programs UV Monitoring Network was established under the guidance of P. Wilkniss, former Director of the Office of Polar Programs. The network is operated and maintained by Biospherical Instruments under a contract from the NSF Office of Polar Programs (Dr. Polly Penhale) via Raytheon Polar Services Company. TOMS (Total Ozone Mapping Spectrometer) data used here were made available by NASA/GSFC, see toms.gsfc.nasa.gov. TOVS (TIROS-N Operational Vertical Sounder) are a courtesy of NESDIS Satellite Research Laboratory, NOAA, and were kindly made available to us by A. C. Neuendorffer.

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