Time evolution of short and intermediate term periodicities of electrons at geosynchronous orbit during solar cycle 23 and 24: A wavelet approach

Partha Chowdhury; B.N. Dwivedi

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Time evolution of short and intermediate term periodicities of electrons at geosynchronous orbit during solar cycle 23 and 24: A wavelet approach

机译：太阳周期23和24中地球同步轨道上电子的短期和中期周期性的时间演化：小波方法

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In this paper, we investigate short and intermediate-term periodicities and their time variations in energetic> electron flares at geosynchronous altitude in two different energy bands for the complete solar cycle 23 and a part of the current cycle 24 using data from Geostationary Operational Environmental Satellites (GOES). The wavelet power spectrum analysis method has been invoked to investigate time variation of the main quasi-periodicities present in the electron flux data. The wavelet power spectrum analysis shows a number of quasi-periodic oscillations in both data sets. In high frequency range, a prominent period of 22-35 day including 27 day oscillation is detected. Other quasi-periods in the range of 40-60 day, 90-100 day, near Rieger periods of 130-140, 180-190 day, Rieger period 150-160 day, ~250 day, 350-370 day and 1.2-1.4 yr are found in different phases of cycle 23. In solar cycle 24, apart from other periods, we have detected the presence of best known "Rieger period" in both data sets. Possible explanations of the observed periodicities are discussed in terms of previous results and r-mode oscillations.

机译：在本文中，我们使用地球静止运行环境卫星的数据，研究了整个太阳周期23和当前周期24的一部分在两个不同能带中地球同步高度的高能>电子耀斑的短期和中期周期及其时间变化。（去）。小波功率谱分析方法已被调用来研究电子通量数据中存在的主要准周期的时间变化。小波功率谱分析显示了两个数据集中的许多准周期振荡。在高频范围内，检测到22-35天的显着时间段，包括27天的振荡。其他准周期在40-60天，90-100天，接近130-140里格期，180-190天，里格期150-160天，〜250天，350-370天和1.2-1.4的范围内yr在周期23的不同阶段中发现。在太阳周期24中，除其他周期外，我们在两个数据集中都检测到了最著名的“里格周期”。根据先前的结果和r模式振荡讨论了观察到的周期性的可能解释。

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《Planetary and space science》 |2012年第1期|p.92-100|共9页
作者
Partha Chowdhury; B.N. Dwivedi;
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作者单位

Department of Physics, University of Calcutta, 92, A P.C Road, Kolkata 700009, India;

Department of Applied Physics, Institute of Technology, Banaras Hindu University, Varanasi 221005, India;

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sun: activity; periodicity; space weather; energetic particle events; rossby waves;

机译：太阳：活动;周期性;空间天气;高能粒子事件;罗斯比波;

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3. Solar cycle variation of 'killer' electrons at geosynchronous orbit and electron flux correlation with the solar wind parameters and ULF waves intensity [J] . A.S. Potapov, B. Tsegmed, L.V. Ryzhakova Acta astronautica . 2014,第jana期

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8. SHORT-TERM FREQUENCY STABILITY Proceedings of the IEEE-NASA Symposium on the Definition and Measurement of Short-Term Frequency Stability held at the Goddard Space Flight Center, Greenbelt, Maryland November 23-24, 1964 [R] . 1962

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Time evolution of short and intermediate term periodicities of electrons at geosynchronous orbit during solar cycle 23 and 24: A wavelet approach

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