{"title":"太阳周期22-24太阳风等离子体随行星际磁场的变化","authors":"Prithvi Raj Singh, Abhay Kumar Singh, Tarun Kumar Pant","doi":"10.1007/s12036-023-09916-0","DOIUrl":null,"url":null,"abstract":"<div><p>In this paper, we have studied the relationship between the monthly variations of solar wind plasma velocity, interplanetary magnetic field (IMF) and geomagnetic activity index (Ap) during solar cycles 22–24 (1986–2020). The modulation parameter (ζ <span>\\( = \\)</span> <i>V</i> * <i>B</i>) is proportional to the product of solar wind plasma velocity, <i>V</i> and strength of the interplanetary magnetic field, <i>B</i>. We have investigated the periodicities and their evolution during solar cycles 22–24 using Fast Fourier Transform (FFT), RobPer periodogram and Continuous Wavelet Transformation methods. The significant periods present in the modulation parameter include the Rieger type, semi-annual period, annual period and quasi-biennial period (mid-term). In this study, we have found that the rotation rate at the base of the convection zone is ~1.30 years. Quasi-biennial oscillations (QBOs) of solar wind plasma velocity, IMF, modulation parameters and Ap have been compared. The modulation parameter appears to be a better representative of the geomagnetic changes than the other two.</p></div>","PeriodicalId":610,"journal":{"name":"Journal of Astrophysics and Astronomy","volume":null,"pages":null},"PeriodicalIF":1.1000,"publicationDate":"2023-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12036-023-09916-0.pdf","citationCount":"0","resultStr":"{\"title\":\"Solar wind plasma variations with interplanetary magnetic field during solar cycles 22–24\",\"authors\":\"Prithvi Raj Singh, Abhay Kumar Singh, Tarun Kumar Pant\",\"doi\":\"10.1007/s12036-023-09916-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this paper, we have studied the relationship between the monthly variations of solar wind plasma velocity, interplanetary magnetic field (IMF) and geomagnetic activity index (Ap) during solar cycles 22–24 (1986–2020). The modulation parameter (ζ <span>\\\\( = \\\\)</span> <i>V</i> * <i>B</i>) is proportional to the product of solar wind plasma velocity, <i>V</i> and strength of the interplanetary magnetic field, <i>B</i>. We have investigated the periodicities and their evolution during solar cycles 22–24 using Fast Fourier Transform (FFT), RobPer periodogram and Continuous Wavelet Transformation methods. The significant periods present in the modulation parameter include the Rieger type, semi-annual period, annual period and quasi-biennial period (mid-term). In this study, we have found that the rotation rate at the base of the convection zone is ~1.30 years. Quasi-biennial oscillations (QBOs) of solar wind plasma velocity, IMF, modulation parameters and Ap have been compared. The modulation parameter appears to be a better representative of the geomagnetic changes than the other two.</p></div>\",\"PeriodicalId\":610,\"journal\":{\"name\":\"Journal of Astrophysics and Astronomy\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.1000,\"publicationDate\":\"2023-02-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://link.springer.com/content/pdf/10.1007/s12036-023-09916-0.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Astrophysics and Astronomy\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s12036-023-09916-0\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Astrophysics and Astronomy","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s12036-023-09916-0","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
摘要
本文研究了太阳活动周期22-24(1986-2020)期间太阳风等离子体速度、行星际磁场(IMF)和地磁活动指数(Ap)的月变化关系。调制参数(ζ \( = \) V * B)与太阳风等离子体速度V和行星际磁场强度B的乘积成正比。我们利用快速傅里叶变换(FFT)、RobPer周期图和连续小波变换方法研究了太阳周期22-24的周期性及其演变。调制参数中存在的显著周期包括Rieger型周期、半年期周期、年周期和准两年周期(中期)。在本研究中,我们发现对流区底部的旋转速率为1.30年。比较了太阳风等离子体速度、IMF、调制参数和Ap的准两年振荡(QBOs)。调制参数似乎比其他两个参数更能代表地磁变化。
Solar wind plasma variations with interplanetary magnetic field during solar cycles 22–24
In this paper, we have studied the relationship between the monthly variations of solar wind plasma velocity, interplanetary magnetic field (IMF) and geomagnetic activity index (Ap) during solar cycles 22–24 (1986–2020). The modulation parameter (ζ \( = \)V * B) is proportional to the product of solar wind plasma velocity, V and strength of the interplanetary magnetic field, B. We have investigated the periodicities and their evolution during solar cycles 22–24 using Fast Fourier Transform (FFT), RobPer periodogram and Continuous Wavelet Transformation methods. The significant periods present in the modulation parameter include the Rieger type, semi-annual period, annual period and quasi-biennial period (mid-term). In this study, we have found that the rotation rate at the base of the convection zone is ~1.30 years. Quasi-biennial oscillations (QBOs) of solar wind plasma velocity, IMF, modulation parameters and Ap have been compared. The modulation parameter appears to be a better representative of the geomagnetic changes than the other two.
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