The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Abnormal ionization in the lower ionosphere associated with cosmic-ray flux enhancements is discussed mostly in terms of the great solar event of February 23, 1956. Two kinds of abnormality were recognized: early effects observable in the dark hemisphere at the time of the sudden cosmic-ray enhancement, and late effects which began gradually and reached a maximum a few hours after the cosmic-ray enhancement...
The results of a program extending over the last four and one-half years to investigate the nature and characteristics of high-loss regular VHF propagation by means of the lower ionosphere are presented. For the most part continuous-wave transmissions are employed, with the result that the effects of the different elements in the propagation are superposed. Three different ionizing agents operating...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.