کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8142394 | 1523889 | 2018 | 31 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electron-impact vibrational excitation of the hydroxyl radical in the nighttime upper atmosphere
ترجمه فارسی عنوان
تحریک ارتعاشی الکترونی رادیکال هیدروکسیل در فضای باز شبانه
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کلمات کلیدی
رادیکال هیدروکسیل، تاثیر الکترونی، تحریک ارتعاشی، مزوسفر،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی
Chemical processes produce vibrationally excited hydroxyl (OH) in a layer centred at an altitude of about 87Â km in the Earth's atmosphere. Observations of this layer are used to deduce temperatures in the mesosphere and to observe the passage of atmospheric gravity waves. Due to the low densities and energies at night of electrons at the relevant altitude, it is not expected that electron-impact excitation of OH would be significant. However, there are unexplained characteristics of OH densities and radiative emissions that might be explained by electron impact. These are measurements of higher than expected densities of OH above 90Â km and of emissions at higher energies that cannot be explained by the chemical production processes. This study simulates the role of electron impact in these processes, using theoretical cross sections for electron-impact excitation of OH. The simulations show that electron impact, even in a substantial aurora, cannot fully explain these phenomena. However, in the process of this investigation, apparent inconsistencies in the theoretical cross sections and reaction rates were found, indicating that measurements of electron-impact excitation of OH are needed to resolve these problems and scale the theoretical predictions to allow more accurate simulations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Planetary and Space Science - Volume 151, February 2018, Pages 11-18
Journal: Planetary and Space Science - Volume 151, February 2018, Pages 11-18
نویسندگان
Laurence Campbell, Michael J. Brunger,