دورية أكاديمية
Long-term trends of foF2 independent of geomagnetic activity
| العنوان: | Long-term trends of foF2 independent of geomagnetic activity |
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| المؤلفون: | A. D. Danilov |
| المصدر: | Annales Geophysicae, Vol 21, Pp 1167-1176 (2003) |
| بيانات النشر: | Copernicus Publications, 2003. |
| سنة النشر: | 2003 |
| المجموعة: | LCC:Science LCC:Physics LCC:Geophysics. Cosmic physics |
| مصطلحات موضوعية: | Science, Physics, QC1-999, Geophysics. Cosmic physics, QC801-809 |
| الوصف: | A detailed analysis of the foF2 data at a series of ionospheric stations is performed to reveal long-term trends independent of the long-term changes in geomagnetic activity during the recent decades (nongeomagnetic trends). The method developed by the author and published earlier is used. It is found that the results for 21 out of 23 stations considered agree well and give a relative nongeomagnetic trend of -0.0012 per year (or an absolute nongeomagnetic trend of about -0.012 MHz per year) for the period between 1958 and the mid-nineties. The trends derived show no dependence on geomagnetic latitude or local time, a fact confirming their independence of geomagnetic activity. The consideration of the earlier period (1948–1985) for a few stations for which the corresponding data are available provides significantly lower foF2 trends, the difference between the later and earlier periods being a factor of 1.6. This is a strong argument in favor of an anthropogenic nature of the trends derived.Key words. Ionosphere (ionosphere-atmosphere interactions; ionospheric disturbances; mid-latitude ionosphere) |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0992-7689 1432-0576 |
| Relation: | https://www.ann-geophys.net/21/1167/2003/angeo-21-1167-2003.pdf; https://doaj.org/toc/0992-7689; https://doaj.org/toc/1432-0576 |
| DOI: | 10.5194/angeo-21-1167-2003 |
| URL الوصول: | https://doaj.org/article/fb2a394a7e5e4197ad2fc3f8e46cd1e6 |
| رقم الأكسشن: | edsdoj.fb2a394a7e5e4197ad2fc3f8e46cd1e6 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 09927689 14320576 |
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| DOI: | 10.5194/angeo-21-1167-2003 |