Study of short-term periodicities in the occurrence of Forbush decreases: wavelet analysis

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
Y. P. Singh,  Badruddin
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Abstract

We utilized the Forbush decreases (magnitude \(>1.5\%\)) detected in cosmic ray neutron monitor data during continuous five solar cycles, viz., 20, 21, 22, 23 and 24 (1965 to 2019) and subjected them to wavelet analysis in order to obtain the possible periodicities in their occurrence. We also studied the periodicities separately during the odd and even solar activity cycles. In addition to solar activity, the solar magnetic polarity and its extension into the interplanetary space makes significant difference in the cosmic ray modulation in the helisphere, we have also applied the wavelet analysis procedure separately during positive (A > 0) and negative (A < 0) polarity states of the heliospheric magnetic fields. Observed periodicities in Forbush decreases have been discussed and compared with earlier detected periodicities in solar and geomagnetic activity indices, e.g., sunspot numbers, sunspot areas, sunspot groups, solar flares, coronal mass ejections, and various geomagnetic activity indices. Significant short-term periodic behaviour detected in the occurrence of Forbush decreases, which in general, corroborates the observed behaviour in solar (in particular, solar eruptive activity) and geomagnetic activity. Understanding the quasi-periodic process in magnetic field emergence from solar active regions and solar eruptive activity, as well as solar-terrestrial coupling and space weather effects, requires comparing the quasi-periodic behaviour between parameters representing solar and geomagnetic activity along with cosmic ray variability.

Abstract Image

Abstract Image

福布什下降现象的短期周期性研究:小波分析
我们利用在连续五个太阳周期,即20、21、22、23和24(1965年至2019年)的宇宙射线中子监测器数据中探测到的福布什递减(幅度为1.5%),并对其进行小波分析,以获得其出现的可能周期性。我们还分别研究了奇数和偶数太阳活动周期的周期性。除了太阳活动之外,太阳磁极及其向行星际空间的延伸也对日球中的宇宙射线调制产生重大影响,因此我们还分别对日球磁场的正极性(A >0)和负极性(A <0)状态进行了小波分析。我们对观测到的福布什下降周期性进行了讨论,并将其与早先探测到的太阳和地磁活动指数的周期性进行了比较,例如太阳黑子数量、太阳黑子面积、太阳黑子群、太阳耀斑、日冕物质抛射以及各种地磁活动指数。在福布什下降现象中发现了重要的短期周期行为,总体上与观测到的太阳活动(特别是太阳爆发活动)和地磁活动的行为相吻合。要了解太阳活动区磁场出现的准周期过程和太阳爆发活动,以及日地耦合和空间天气效应,就需要比较代表太阳和地磁活动的参数与宇宙射线变异性之间的准周期行为。
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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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