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
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
Exploring the global shock scenario at multiple points between sun and earth: The solar transients launched on January 1 and September 23, 1978
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 km−1 in the January and September events, respectively, and much slower flank speeds (∼600 km−1 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° × 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
نویسندگان
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