On midrange periodicities in solar radio flux and sunspot areas
On midrange periodicities in solar radio flux and sunspot areas
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DOI：
10.1007/s10509-018-3306-1
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发表时间：
2018-03
影响因子：
1.9
通讯作者：
Y. Mei;H. Deng;Feng Wang
中科院分区：
文献类型：
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作者：
Y. Mei;H. Deng;Feng Wang
利用Hilbert-Huang变换技术，我们研究了1947年2月1日至2016年9月30日期间2800 MHz（F10.7）太阳射电流量和太阳黑子面积（SA）的中期周期性。结果表明：（1）两个数据集的准周期振荡不完全相同，如自转周期、中程周期和施瓦贝周期。特别是37.9 ~ 297.3天的中程周期与磁Rossby型波有关;（2）太阳活动指标的1.3年和1.7年波动是地表表现（从光球到日冕）太阳内部深处产生的磁通量变化;（3）在施瓦贝旋回的时间尺度上，三个时段的复杂相关系（1947-1958，1959-1988和1989-2016）同意磁Rossby型波的周期性。研究结果表明，磁Rossby型波是太阳活动指标的中期周期背后的可能的物理机制。此外，光球和日冕活动之间的关系的显着变化发生在第22周的最大值可以解释的磁Rossby型波。
Using the Hilbert-Huang transform technique, we investigate the midrange periodicities in solar radio flux at 2800 MHz (F10.7) and sunspot areas (SAs) from February 1, 1947 to September 30, 2016. The following prominent results are found: (1) The quasi-periodic oscillations of both data sets are not identical, such as the rotational cycle, the midrange periodicities, and the Schwabe cycle. In particular, the midrange periodicities ranging from 37.9 days to 297.3 days are related to the magnetic Rossby-type waves; (2) The 1.3-year and 1.7-year fluctuations in solar activity indicators are surface manifestations (from photosphere to corona) of magnetic flux changes generated deep inside the Sun; (3) At the timescale of the Schwabe cycle, the complicated phase relationships in the three intervals (1947–1958, 1959–1988, and 1989–2016) agree with the produced periodicities of the magnetic Rossby-type waves. The findings indicate that the magnetic Rossby-type waves are the possible physical mechanism behind the midrange periodicities of solar activity indicators. Moreover, the significant change in the relationship between photospheric and coronal activity took place after the maximum of solar cycle 22 could be interpreted by the magnetic Rossby-type waves.