کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1769093 | 1020254 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spectral and temporal properties of narrowband dm-spikes and broadband pulses in the August 5, 2003 flare
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
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چکیده انگلیسی
On August 5, 2003 the OndÅejov radiospectrograph and the Brazilian Solar Spectrograph recorded simultaneously the narrowband dm-spikes superimposed on broadband pulses in the frequency ranges of 0.8-4.5 and 1.75-2.25Â GHz, respectively. Using a new method of wavelet filtering broadband sub-second pulses with a frequency width of 0.48Â GHz and narrowband millisecond spikes with a frequency width 0.13Â GHz were recognized and analysed in detail. Filtered radio spectra showed that the spikes were clustered in stripes at different frequencies. These stripes drifted and their frequency ratios changed during short time intervals. Periods of the narrowband spikes and their stripes were â¼0.4Â s and 4, 8-10, and 16Â s, respectively. The main period of the broadband pulses was â¼4Â s. Values of significant periods of the narrowband spikes coincided with those of the broadband pulses. We found significant peak-to-peak correlations with zero time lags among stripes of the narrowband spikes on different frequencies. The characteristics of the narrowband dm-spikes and broadband pulses indicate that mutually linked emission processes generate both fine structures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 38, Issue 5, 2006, Pages 979-985
Journal: Advances in Space Research - Volume 38, Issue 5, 2006, Pages 979-985
نویسندگان
R.A. Sych, H.S. Sawant, M. Karlický, H. Mészárosová,