Solar UV, stratospheric ozone and UVB

The variations of stratospheric ozone and UVB observed at ground were compared with those solar indices. During sequences 27-day oscillations, X-ray had very large amplitudes (exceeding 50%), EUV near 30 nm ~20%, Lyman alpha 121.6 ~10%, Mg II 280 ~5%, continua 180-210 ~2%, 210-240 ~1.5%, 240-300 ~1%, 300-350 ~0.5%. There distinct peaks seen in all these, spacing roughly about 27 days. For effects on ozone, the relevant wavelengths are mostly continua. In sequences, Dobson Arosa (47° N, 10° E) showed fluctuations (~50%) many peaks, but did not match one such sequence, TOMS overpass over Kagoshima, Japan (32° 121° (295-325 nm) Kagoshima day-to-day fluctuations, ~20% for ~50% or UVB, each other, nor indices, thus indicating altogether different mechanisms as their causes. long-term changes largest seasonal variation (~40% range, peak to trough) next QBO (Quasi-biennial oscillation, ~7%, trough). Solar cycle ranges (peak only ~2.6% 19 (sunspot maximum number 210), ~3.5% 20 111) uncertain thereafter, because global depletion which started 1980. 1991-1997, monthly values Thessaloniki, Greece (40° 23° anti-correlated 305 (1% decrease corresponded ~2% increase), poorly correlated 325 that ozone-UVB relationship was highly wavelength-dependent. However, whereas indices a 1991 minimum 1996, neither any two resemblance index variations. particular, level high decreased considerably within years (by 1993). A comparison N) Syowa (69° S) this drop is related due ozone.