预测未来15个太阳活动周期
Prediction of future fifteen solar cycles
摘要:
在以前的研究中(Hiremath 2006 a),太阳周期被建模为一个强迫和阻尼谐振子,并从所有22个周期(1755-1996),长期的振幅,频率,相位和衰减因子。利用前22个太阳活动周的这些物理参数,通过{ \em自回归模型},我们预测了未来15个太阳活动周的振幅和周期。预测的当前太阳活动周(23)的振幅与观测结果非常吻合。目前的周期是11.73年。有了这些令人鼓舞的结果,我们还预测了未来15个太阳活动周期的轮廓。重要的预测是:(i)周期24的周期和振幅分别为9.34年和110($\pm 11$),(ii)周期25的周期和振幅分别为12.49年和110($\pm$ 11),(iii)在周期26期间(公元2030-2042年),27(公元2042-2054年),34(公元2118-2127年),37(公元2152-2163年)和38(公元2163-2176年),太阳可能会经历一个非常高的太阳黑子活动,(四)太阳也可能经历一个非常低的第31周太阳黑子活动(2089-2100 AD)和(v)太阳活动周期的长度变化从8.65年的周期33到最大的13.07年的周期35。
英文摘要:
In the previous study (Hiremath 2006a), the solar cycle is modeled as a forced and damped harmonic oscillator and from all the 22 cycles (1755-1996), long-term amplitudes, frequencies, phases and decay factor are obtained. Using these physical parameters of the previous 22 solar cycles and by an {\em autoregressive model}, we predict the amplitude and period of the future fifteen solar cycles. Predicted amplitude of the present solar cycle (23) matches very well with the observations. The period of the present cycle is found to be 11.73 years. With these encouraging results, we also predict the profiles of future 15 solar cycles. Important predictions are : (i) the period and amplitude of the cycle 24 are 9.34 years and 110 ($\pm 11$), (ii) the period and amplitude of the cycle 25 are 12.49 years and 110 ($\pm$ 11), (iii) during the cycles 26 (2030-2042 AD), 27 (2042-2054 AD), 34 (2118-2127 AD), 37 (2152-2163 AD) and 38 (2163-2176 AD), the sun might experience a very high sunspot activity, (iv) the sun might also experience a very low (around 60) sunspot activity during cycle 31 (2089-2100 AD) and, (v) length of the solar cycles vary from 8.65 yrs for the cycle 33 to maximum of 13.07 yrs for the cycle 35.
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