{"title":"Solar Energetic Particles and Intensity of Metric Type II Radio Bursts","authors":"Yuriy T. Tsap, Elena A. Isaeva, Yulia G. Kopylova","doi":"10.1007/s11207-023-02247-x","DOIUrl":null,"url":null,"abstract":"<div><p>We perform a statistical analysis of 112 proton events from 24 November 2000 to 20 December 2014, accompanied by an increase in the intensity of solar energetic particles (SEPs) with energy <span>\\(E_{p} > 1\\)</span>–850 MeV using GOES data. All events were accompanied by metric type II radio bursts in the frequency range of 25–180 MHz observed with the <i>Radio Solar Telescope Network</i>. A correlation in the peak proton integral intensity <span>\\(I_{p}\\)</span> with the intensity of type II radio bursts <span>\\(I_{i}\\)</span> and the frequency drift rate <span>\\(V\\)</span> is shown. Taking into account the helio-longitudinal weakening, i.e. the dependence of SEP intensity on the heliographic longitude of the flare, we find that the correlation coefficients between <span>\\(I_{p}\\)</span> and <span>\\(I_{i}\\)</span>, as well as between <span>\\(I_{p}\\)</span> and <span>\\(V\\)</span> for protons with <span>\\(E_{p} > 30\\)</span> MeV are 0.79 and 0.71, respectively. This suggests that non-thermal electrons, which drive type II radio bursts, and energetic protons are generated at the front of the same shock wave. The correlation coefficients mentioned above decrease for <span>\\(E_{p} \\gtrsim100\\)</span> MeV. Therefore, the contribution of high energetic protons to the integral intensity <span>\\(I_{p}\\)</span> is rather determined by accelerated processes in the flare energy release region. The weak dependence of SEP intensity on the helio-longitudinal weakening is discussed.</p></div>","PeriodicalId":777,"journal":{"name":"Solar Physics","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solar Physics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s11207-023-02247-x","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
We perform a statistical analysis of 112 proton events from 24 November 2000 to 20 December 2014, accompanied by an increase in the intensity of solar energetic particles (SEPs) with energy \(E_{p} > 1\)–850 MeV using GOES data. All events were accompanied by metric type II radio bursts in the frequency range of 25–180 MHz observed with the Radio Solar Telescope Network. A correlation in the peak proton integral intensity \(I_{p}\) with the intensity of type II radio bursts \(I_{i}\) and the frequency drift rate \(V\) is shown. Taking into account the helio-longitudinal weakening, i.e. the dependence of SEP intensity on the heliographic longitude of the flare, we find that the correlation coefficients between \(I_{p}\) and \(I_{i}\), as well as between \(I_{p}\) and \(V\) for protons with \(E_{p} > 30\) MeV are 0.79 and 0.71, respectively. This suggests that non-thermal electrons, which drive type II radio bursts, and energetic protons are generated at the front of the same shock wave. The correlation coefficients mentioned above decrease for \(E_{p} \gtrsim100\) MeV. Therefore, the contribution of high energetic protons to the integral intensity \(I_{p}\) is rather determined by accelerated processes in the flare energy release region. The weak dependence of SEP intensity on the helio-longitudinal weakening is discussed.
期刊介绍:
Solar Physics was founded in 1967 and is the principal journal for the publication of the results of fundamental research on the Sun. The journal treats all aspects of solar physics, ranging from the internal structure of the Sun and its evolution to the outer corona and solar wind in interplanetary space. Papers on solar-terrestrial physics and on stellar research are also published when their results have a direct bearing on our understanding of the Sun.