کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9827674 | 1523683 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fine structure of microwave emission in the 25 August 1999 event and its association with the magnetic field fine structure
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
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چکیده انگلیسی
A study is made of the initial stage of the 25 August 1999, event using high time-resolution microwave observations, as well as the data from the Siberian Solar Radio Telescope and Yohkoh/SXT/HXT. Microwave emission revealed fine structures with a typical time scale of about 1Â s with a frequency drift â¼1Â GHz/s, and structures with a typical time scale of less than 0.1Â s with a frequency drift â¼10Â GHz/s. Emission bands with a slower frequency drift are generated by energetic electrons subjected to the cyclotron resonance condition. This slower frequency drift is a consequence of a change in plasma density caused by the coalescence of magnetic structures with a typical size of the order of â¼108Â cm, while the emission with a faster drift is generated by beams of energetic electrons generating Cherenkov resonance emission. The energetic electron beams are produced as a result of the interaction of magnetic structures â¼106-107Â cm in size.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 67, Issues 17â18, December 2005, Pages 1720-1727
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 67, Issues 17â18, December 2005, Pages 1720-1727
نویسندگان
V.G. Ledenev, R.A. Sych, Y. Yan, Q. Fu, G. Huang, H. Wu,