Seasonal changes of activity factor for Jupiter’s hemispheres restored its periodicity
| 1Vidmachenko, AP 1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2019, 35(4):71-80 |
| https://doi.org/10.15407/kfnt2019.04.071 |
| Start Page: Dynamics and Physics of Solar System Bodies |
| Language: Russian |
Abstract: We have concluded that in the powerful magnetosphere of Jupiter, the sunflower point, changing over the orbital period by an angle of >26°, causes variations in physical characteristics of the atmosphere, manifesting seasonal changes. A significant eccentricity of the planetary orbit leads to the fact that the influx of energy to the atmosphere in the northern hemisphere is 21 % greater, because at the moment close to the summer solstice for the northern hemisphere, the planet is at perihelion. This causes the asymmetry of the meridional distribution of the reflective properties of the visible cloud layer. Analysis of observational data for years 1960—2019 shows that the ratio AJ = BN/BS describes well the changes in atmospheric processes on Jupiter, showing quasi-periodic variations of reflective characteristics of northern and southern temperate and tropical regions during the period of orbital moving around Sun over ≈11.87 years. The change in Jupiter’s integral brightness in the V visual filter indicates a more pronounced effect of a 22.1-year Hale magnetic cycle of solar activity. The results of observations in visible light in 1960—1995 and 2012—2019 showed a synchronous delay of several years as a reaction on a 21 % change of the influx to different hemispheres when the planet moves in orbit. In 1995—2012 a disagreement was observed between the dependence of AJ, the index of solar activity Sn and the mode of irradiation of Jupiter by the Sun due to its orbital motion. After 2012, the course of the time dependence of these three parameters again became consistent, restoring the periodicity in the changes in the photometric characteristics of the northern and southern hemispheres of Jupiter. |
| Keywords: atmosphere, Jupiter, seasonal variations |
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