کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1765124 | 1020085 | 2011 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Quasi 9 and 30-40Â days periodicities in the solar differential rotation
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Quasi 9 and 30-40Â days periodicities in the solar differential rotation Quasi 9 and 30-40Â days periodicities in the solar differential rotation](/preview/png/1765124.png)
چکیده انگلیسی
Using the daily Mt. Wilson Doppler velocity data during 1986-1994 (solar cycle 22), we studied the short-term variations of the order of a few days to a month timescales in the solar differential rotation. We represent the differential rotation in the form: Ï(λ)=A¯+B¯(5sin2λ-1)+C¯(21sin4λ-14sin2λ+1), using a set of Gegenbauer polynomials, where Ï(λ) is the angular velocity at latitude λ. The coefficients A¯,B¯, and C¯ are free of crosstalk. We found that â9-day periodicity is statistically highly significant in the variations of C¯ at the maximum of solar cycle 22. A similar periodicity is found in the variations of B¯ during the descending phase of the cycle 22 with significant on ⩾99.9% confidence level. At this cycle maximum, a 30-40 day periodicity is found to be dominant among the variations in B¯, and this periodicity is found in A¯ during almost throughout the period 1986-1994. The â9-day periodicity in the variation of the differential rotation approximately matches with the known quasi 10-day periodicity in the total solar irradiance (TSI) variability. Hence, we speculate that there exists a relationship between the differential rotation and TSI variability. We suggest that the 9-10 day periodicities of the differential rotation and TSI have a relationship with the production and the emergence rates of the large-scale solar magnetic flux.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 48, Issue 6, 15 September 2011, Pages 1032-1040
Journal: Advances in Space Research - Volume 48, Issue 6, 15 September 2011, Pages 1032-1040
نویسندگان
J. Javaraiah,