Physics of auroral phenomena : proceedings of the 33rd Annual seminar, Apatity, 02 - 05 March, 2010 / [ed.: A.G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2011. - 206 с. : ил.

B.D. Mendeva at al. minimum TOC values is about 150 DU. This ozone seasonal course doesn’t correspond to the solar radiation energy distribution throughout the year. It is different from the course of other parameters as well, such as temperature, humidity, air pressure, which follow the course o f the solar radiation with a certain delay at all latitudes. Days (1999-2003) Days (1999-2005) Fig. 4. Annual TOC variations, measured by the Photon spectrometer (open diamonds) presented together with (a) GOME on ERS-2 satellite data (black circles) during 1999-2003 and with (b) TOMS data (black circles) during 1999-2005. 500 450 250 200 150------- .------- ,------- -------- ,--------------- -------- 250 270 290 310 330 350 370 390 TOC, DU (TOMS) Fig. 5. Correlation straight line between TOC monthly mean values (2002-2005), measured by TOMS-ЕР and SCIAMACHY For tracking out the TOC course for a longer period we use TOMS and SCIAMACHY data. The 180 results from both instruments, simultaneously operating in the period 2002 - 2005 are compared. There is a good agreement between them : R = 0.95 (Fig.5). This allows to use the consecutive TOMS data (1997-2002) and the SCIAMACHY data (2003- 2008) for investigation o f the ozone behavior in the period 1997-2008 (Fig. 6). 500 -j 200 \ 150 j 100 I------г------------------ -------,------,----- ------,-----r------,---------------- 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 Year Fig. 6. Behaviour o f the monthly mean ozone data from TOMS-EP (1997-2002) and SCIAMACHY (2003-2008). This figure shows a quasi-biennial periodicity in the amplitudes of the ozone maximums. For example, in 1999, 2001, 2003 etc. these amplitudes are bigger than in 2000, 2002, 2004 etc. and the biggest TOC maximum (400 DU) is registered in March 2003 and the smallest one (357 DU) - in March 2000. Our analysis shows that there is no any trend in TOC course in this period. Despite the absence o f a trend in the whole period, different trend values have been obtained for the various seasons. Thus, in winter (December) and in spring (March) the linear trend is positive, respectively 2.2% and 0.2%, and in summer (July) and in autumn (September) it is negative : - 3.5% and - 1.6%. This result shows that a seasonal dependence o f TOC trend probably exists. The solar eclipse is an event, which gives the opportunity to receive important information about the sun itself as well as about the influence o f the solar radiation on the processes, defining the atmospheric components dynamics. The course of some wavelength irradiances, registered by Photon during the eclipse on 29 March 2006 (76% max coverage for Stara Zagora) and on 11 August 1999 (96% max coverage) describes very well the moments characterizing the eclipse: beginning, maximum phase, end (Fig. 7). The analysis o f the results shows that the radiation decrease near the max phase is different for separate wavelengths. The irradiance at shorter wavelengths is reduced more than at longer ones (limb darkening effect). The TOC variability, registered by Photon’s measurements, during two solar eclipses: on 11 August 1999 and on 29 March 2006, is illustrated in Fig. 8. It shows almost the same time-pattems