کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8139433 1523579 2018 28 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Type II solar radio burst band-splitting: Measure of coronal magnetic field strength
ترجمه فارسی عنوان
نوع دوم رادیویی خورشیدی رادیویی: اندازه گیری قدرت میدان مغناطیسی کرونال
کلمات کلیدی
رادیو انفجار، نوع دوم، تخلیه جرم کرونال، امواج، شوکه شدن، میدانهای مغناطیسی، کرونا،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی
Studies of the relationship between solar radio bursts and CMEs are essential for understanding of the nature of type II bursts. In this study, we examine the type II solar radio burst recorded on 16 March 2016 by the Learmonth radio spectrograph and compare its characteristics with the kinematics of the associated CMEs observed by STEREO and SOHO spacecraft. The burst showed a well-defined band-split, which was used to estimate the magnetic field strength in the solar corona. The magnetic field decreases from ≈ 4 G at R ≈ 2.6 R⊙to 0.62 G at R ≈ 3.77 R⊙ depending on the coronal electron density model employed. We found that two CMEs occurred successively in a 4-h interval. During this interval, a type II radio burst occurred, lasting for about 10 min. Tracking of the shock that produced type II burst and comparison with the CMEs heights as observed by STEREO and SOHO spacecraft help us to deduce the driver of the shock. According to the analysis, the type II burst occurrence was associated with the interaction of the shock driven by the second CME with a streamer located south of the first CME, since that the type II band-split significantly increased during the shock-streamer interaction. Our results show that the analysis of the type II burst band-split supplemented by the coronagraphic observations of the corona is an important tool for the understanding of the coronal eruptive processes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 172, July 2018, Pages 75-82
نویسندگان
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