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.

"Physics o f Auroral Phenomena", Proc. XXXIII A n n u a l Seminar, Apatity, pp. 1 9 7 - 200, 2011 © Kola Science Centre, Russian Academy of Science, 2011 Polar Geophysical Institute ON MANIFESTATION OF PERIODICAL DISTURBANCES OF INTERPLANETARY MEDIUM IN FLUCTUATIONS OF UNTIL OXIDATION HALF-TIME E.S. Gorshkov1, V.V. Ivanov1, V .V . S oko lov sk i2 1St. Petersburg Branch o f the Institute o f Terrestrial Magnetism, Ionosphere and Radio Wave Propagation o f The Russian Academy o f Sciences, Saint Petersburg, Russia 2The Institutefo r Analytical Instrumentation o f The Russian Academy o f Sciences, Saint Petersburg, Russia Abstract. The sequence of daily data of unithiol oxidation half-time (UOHT) with sodium nitrite during the 21- year cycle of solar activity (SA) was analyzed. It was shown that fluctuations of UOHT are determined by combined influences of cosmophysical factors of various origins, relating to manifestations o f SA and basic (gravitational) disturbances caused by the Sun, and that the leading role of a certain cosmophysical factor in this relation depends on the phase of the SA cycle. The influence of periodical disturbances of interplanetary medium on the UOHT fluctuations observed is also described. 1. Introduction There are several works on influence of various physical factors on unithiol test results published [for example, 1], but we still cannot consider this field to be completely explored. Not so long ago it was thought that unithiol oxidation half-time is basically determined by influence of cosmophysical agents of electromagnetic origin (solar and geomagnetic activities). However, the year long monitoring (1996-1997) at the Antarctic station Mimiy revealed influence of a physical factor of another origin and relating to gravitational disturbances from the Sun to the Earth and the Moon [2]. The spectral content of UOHT gave explanation to the periods related to manifestation of the disturbance from the Sun to the Moon: c.14.8 days (variation), c.31.8 days (evection). A reliable correlation between annual fluctuations of UOHT and the known gravitational factors influencing the biosphere and being characterized with equation of time (ET) and equation of the equinoxes (EE) [3] was detected. The results made it possible to analyze the sequence of daily average UOHT indices for 1974-1985 from new points of view. It should be mentioned that UOHT measurements in the indicated period were aimed at solving a variety o f tasks and, due to the fact, the regularity of tracking indices was not constant throughout the 21-year period. We decided to address to the data due to our intention to collect (in retrospective) maximum data in order to solve the most urgent task (to our opinion), which is related to a combined influence o f various cosmophysical factors on the UOHT dynamics. Since there is no strict compliance between genetic (electromagnetic or non-electromagnetic origin) and time characteristics of different kinds of UOHT fluctuations, we use a better-known time periodization to describe experimental data. In accordance to the periodization, rhythms are divided into mesorhythms (24 hours to 2 months), circannian rhythms and months-long rhytms. We used STATISTICA 6.0 software and the method of adaptive filtration (for detecting months-long periods). 2. Mesorhythms and circannian fluctuations in the dynam ics of unithiol test results In the spectrum of UOHT fluctuations (after the polynomial trend was excluded), the spectral analysis revealed harmonics with periods relating to the influence of cosmophysical factors of both electromagnetic and non- electromagnetic origins: 55.35, 52.51, 74.47, 16.38, 31.75, 60,24, 64, 44.04, 21.11, 25.13, 28.64 and 14.95 days. Obviously, the periods correlate with the periods of solar and geomagnetic activities [4], as well as with the nutation periods (evections and variations). For the interval respective to the minimum and increase o f SA (1975-1978), there were mainly the periods approximate to solar disturbance periods that revealed themselves in the UOHT spectra most distinctly. Their amplitudes are noticeably higher than the amplitudes o f the harmonics describing the periods of solar and geomagnetic activities. At the maximum of the cycle (1979-1981) the influence of SA increases, comparing to the gravity influence. We used the 5th degree polynomial smoothing method to detect UOHT circannian fluctuations (CF) within the time interval of 1975-1984. As natural analogues to the detected CF, we chose the above-mentioned equation of time, which describes onward motion of the Earth, and the equation of the equinoxes, which defines ripples in the spin motion of the Earth (the degree of misalighnment of the Earth’s axe in relation to the celestial pole) - similarly to the work [2]. 197