Physics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002kfnt...18..227v&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 18, no. 3, p. 227-242
Physics
1
Scientific paper
Our analysis shows that the motion of gas and aerosol with the vertical velocity w = 10-50 cm/s determines the amount of visible clouds giant planets and therefore can be used to find the reflectance characteristics of the observable cloud layer. In the presence of certain factors causing a change in the vertical motion velocity and in the direction of such a motion the cloud formation and/or destruction modulated. In this connection we assume that fluctuation in the cloud formation and disintegration can serve as a preferable method for the detection of possible oscillations in the atmospheres of giant planets. Our calculations for Jupiter's Equatorial Zone (EZ) at 400 nm showed that the air mass lifting with the vertical velocity w = 30 cm/s for a time of about two hours can result in the maximum absolute reflectivity increase equal to 0.0012 (at an average value of 0.390). The brightness variations of Jupiter's EZ are studied by the maximum entropy spectral analysis (MESA). The MESA spectrum of Jupiter's EZ brightness oscillations gives the following periods and amplitudes: for T1=3.90± 0.01 min, A1=(0.6&pm 0.1)\cdot{0.001m}; T2=(20.11±0.23) min, A2=(2.3±0.1)\cdot{0.001m}; T3=(47.50±0.21) min, A3=(0.9±0.1)\cdot{0.001m}; T4=(101.7±0.6) min, A4=(1.5±0.3)\cdot{0.001m}; T5=(107.1±0.6) min, A5=(5.4±0.5)\cdot{0.001m}; T6=(141.9±1.5) min, A6=(1.0±0.3)\cdot{0.001m}. All these periods fall within a 90-percent confidence interval. The periods T1, T2, T3, and T5 are responsible for the brightness periodicity caused by the Earth's atmospheric transparency. The periods T4 and T6 coincide with theoretical prediction of free oscillation modes for Jupiter's atmosphere.
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