| Автор | Austin, L. W. |
| Дата выпуска | 1930 |
| dc.description | The figure shows a comparison of the monthly averages of sunspot‐numbers, terrestrial‐magnetic activity (horizontal range) as measured at Cheltenham (Maryland), and the daytime radio field‐strength of signals received in Washington from the transmitting stations FYL at Bordeaux, France (f = 15.9 kc, λ = 18,900 m) and DFW at Nauen, Germany (f = 23.4kc, λ = 12,800m). The resemblance of the sunspot‐curve to the other three is not close, but the similarity in the changes in magnetic activity to those in daylight signal‐strength seems to be. unmistakable. The resemblance of the Bordeaux signal‐curve to that of the magnetic activity seems closer even than the resemblance between the two signal‐curves. The deep drop of both the magnetic and signal‐values in November (more rarely in December) is especially striking. This early winter drop in signals has often been noticed, and in the case of transmission between Europe and America, has been sometimes ascribed to the proximity of the signal‐path to the area of Arctic darkness. It now appears that this and other seasonal variations both in magnetic activity and east‐west long‐wave signal‐strength may be due to common causes. |
| Формат | application.pdf |
| Копирайт | Copyright 1930 by the American Geophysical Union. |
| Название | A comparison of sunspot‐numbers, terrestrial‐magnetic activity, and long‐wave radio signal‐strength |
| Тип | miscellaneous |
| DOI | 10.1029/TE035i001p00049 |
| Electronic ISSN | 0096-8013 |
| Print ISSN | 0096-8013 |
| Журнал | Terrestrial Magnetism and Atmospheric Electricity |
| Том | 35 |
| Первая страница | 49 |
| Последняя страница | 50 |
| Выпуск | 1 |
| Библиографическая ссылка | , Terr. Mag., 34, 225–229, 1929. |
