{"title":"在MWO和CrAO进行的太阳黑子磁场测量：太阳周期24衰减和极小阶段的无线电发射F10.7","authors":"Z. S. Akhtemov, Yu. T. Tsap, V. M. Malaschuk","doi":"10.1134/S0016793223080029","DOIUrl":null,"url":null,"abstract":"<p>A comparative analysis of the evolution of the maximum magnetic field of sunspots, obtained at Mount Wilson Observatory (9033 measurements) and the spectral flux of radio emission at a frequency of 2.8 GHz (<i>F</i><sub>10.7</sub>) during the declining and minimum phase of solar cycle 24 (2014–2019), is carried out. An anomalous behavior of the magnetic field of sunspots with a strength of 1500 G or higher has been detected, which is characterized by even a slight increase in the sunspot magnetic field during the declining phase of the cycle, which is in a good agreement with the results of observations by the BST-2 telescope of the Crimean Astrophysical Observatory and with measurements of the areas of the biggest spot in a group according to the data of the Kislovodsk Mountain Astronomical Station. Despite a noticeable increase in the average values of the magnetic field from 2015 to 2017, no significant changes were found in the scatter diagram of the <i>F</i><sub>10.7</sub> solar activity index and Wolf numbers. This indicates the decisive contribution to the index <i>F</i><sub>10.7</sub> of the thermal bremsstrahlung mechanism of radio emission.</p>","PeriodicalId":55597,"journal":{"name":"Geomagnetism and Aeronomy","volume":"63 8","pages":"1144 - 1148"},"PeriodicalIF":0.7000,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Sunspot Magnetic Field Measurements at MWO and CrAO: Radio Emission F10.7 during the Declining and Minimum Phase of Solar Cycle 24\",\"authors\":\"Z. S. Akhtemov, Yu. T. Tsap, V. M. Malaschuk\",\"doi\":\"10.1134/S0016793223080029\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>A comparative analysis of the evolution of the maximum magnetic field of sunspots, obtained at Mount Wilson Observatory (9033 measurements) and the spectral flux of radio emission at a frequency of 2.8 GHz (<i>F</i><sub>10.7</sub>) during the declining and minimum phase of solar cycle 24 (2014–2019), is carried out. An anomalous behavior of the magnetic field of sunspots with a strength of 1500 G or higher has been detected, which is characterized by even a slight increase in the sunspot magnetic field during the declining phase of the cycle, which is in a good agreement with the results of observations by the BST-2 telescope of the Crimean Astrophysical Observatory and with measurements of the areas of the biggest spot in a group according to the data of the Kislovodsk Mountain Astronomical Station. Despite a noticeable increase in the average values of the magnetic field from 2015 to 2017, no significant changes were found in the scatter diagram of the <i>F</i><sub>10.7</sub> solar activity index and Wolf numbers. This indicates the decisive contribution to the index <i>F</i><sub>10.7</sub> of the thermal bremsstrahlung mechanism of radio emission.</p>\",\"PeriodicalId\":55597,\"journal\":{\"name\":\"Geomagnetism and Aeronomy\",\"volume\":\"63 8\",\"pages\":\"1144 - 1148\"},\"PeriodicalIF\":0.7000,\"publicationDate\":\"2024-01-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Geomagnetism and Aeronomy\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S0016793223080029\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"GEOCHEMISTRY & GEOPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geomagnetism and Aeronomy","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1134/S0016793223080029","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
Sunspot Magnetic Field Measurements at MWO and CrAO: Radio Emission F10.7 during the Declining and Minimum Phase of Solar Cycle 24
A comparative analysis of the evolution of the maximum magnetic field of sunspots, obtained at Mount Wilson Observatory (9033 measurements) and the spectral flux of radio emission at a frequency of 2.8 GHz (F10.7) during the declining and minimum phase of solar cycle 24 (2014–2019), is carried out. An anomalous behavior of the magnetic field of sunspots with a strength of 1500 G or higher has been detected, which is characterized by even a slight increase in the sunspot magnetic field during the declining phase of the cycle, which is in a good agreement with the results of observations by the BST-2 telescope of the Crimean Astrophysical Observatory and with measurements of the areas of the biggest spot in a group according to the data of the Kislovodsk Mountain Astronomical Station. Despite a noticeable increase in the average values of the magnetic field from 2015 to 2017, no significant changes were found in the scatter diagram of the F10.7 solar activity index and Wolf numbers. This indicates the decisive contribution to the index F10.7 of the thermal bremsstrahlung mechanism of radio emission.
期刊介绍：
Geomagnetism and Aeronomy is a bimonthly periodical that covers the fields of interplanetary space; geoeffective solar events; the magnetosphere; the ionosphere; the upper and middle atmosphere; the action of solar variability and activity on atmospheric parameters and climate; the main magnetic field and its secular variations, excursion, and inversion; and other related topics.
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