کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1765795 | 1020119 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Exploring the global shock scenario at multiple points between sun and earth: The solar transients launched on January 1 and September 23, 1978
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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
We revisit the transient interplanetary events of January 1 and September 23, 1978. Using in-situ and remote sensing observations at locations widely separated in longitudes and distances from the Sun, we infer that in both cases the overall shock surface had a very fast “nose” region with speeds >900 and >1500 kmâ1 in the January and September events, respectively, and much slower flank speeds (â¼600 kmâ1 or less), suggesting a shock surface with a strong speed gradient with heliospheric longitude. The shock-nose regions are thus likely efficient acceleration sites of MeV ions, even at 1 AU from the Sun. Our 3D magnetohydrodynamics modeling suggests that a 24° Ã 24° localized disturbance at 18 solar radii injecting momentum 100 times the background solar wind input over 1 h can produce a disturbance in semi-quantitative agreement with the observed shock arrival time, plasma density and velocity time series in the January 1978 event.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 43, Issue 1, 5 January 2009, Pages 113-119
Journal: Advances in Space Research - Volume 43, Issue 1, 5 January 2009, Pages 113-119
نویسندگان
D.B. Berdichevsky, D.V. Reames, C.-C. Wu, R. Schwenn, R.P. Lepping, R.J. MacDowall, C.J. Farrugia, J.-L. Bougeret, C. Ng, A.J. Lazarus,