کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9827718 | 1523685 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Solar activity signatures in mesopause region temperatures and atomic oxygen related airglow brightness at El Leoncito, Argentina
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Rotational temperatures and airglow brightness variations of the OH(6-2) and O2(0-1) bands measured at El Leoncito (32âS,69âW) from 1998 to 2002 are analysed to detect solar activity signatures. The emissions correspond to nominal altitudes of 87 and 95Â km, respectively. The homogeneous and consistent data set covers the rise, the two distinct maxima, and the start of the decline of the present solar activity cycle. The modulation of solar activity around the Gnevyshev gap (particularly pronounced in this cycle) has been so strong as to motivate the expectation to detect its signature in such a relatively short data set. While at 87Â km, we practically observe no correlation with solar radio flux, or at most a weak correlation in temperature, we find a moderate positive temperature and airglow brightness effect at 95Â km. This is a remarkable difference, in view of the small separation between the two altitude levels. The quantitative results lie close to the lower limits of our previous estimates in a recent trend analysis. However, the behaviour at 95Â km changes abruptly between anticorrelation, correlation, and no correlation. From December 1998 to July 2001 the correlation was very strong. From the standpoint of atmospheric nonlinear dynamics, variations in the degree of correlation in different years and at different observing sites should not be surprising.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 67, Issues 1â2, January 2005, Pages 145-154
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 67, Issues 1â2, January 2005, Pages 145-154
نویسندگان
J. Scheer, E.R. Reisin, C.H. Mandrini,