Titre du document

IGY Bulletin No. 15, 16

Lien vers le document
Nom du Corpus

AstroConcepts

Auteur(s)
  • Anonymous Anonymous
Résumé

Long?range, short?wave radio transmissions depend on conditions in the ionosphere, an electrified region of the atmosphere extending from approximately 45 to 250 mi above the earth's surface. The ionosphere contains several semi?permanent ionized layers which reflect most radio waves having wavelengths between 10 m and 10 km. Multiple reflection of a radio signal between ionospheric layers and the earth makes longdistance short?wave transmission possible. The ionospheric layers are extremely variable with time and space and are extremely sensitive to the mood of the sun. The waxing and waning of splar activity during the eleven?year solar cycle is accompanied by changes in the reflectivity and other characteristics of the ionospheric layers. These changes may cause absorption of signals or propagation in unexpected directions or to unusual distances. They can be studied by analysis of a large number of radio contacts between distant points.

Langue(s) du document
Anglais
Année de publication
1958
Revue

Eos, Transactions American Geophysical Union

Éditeur
Wiley
Type de publication
journal
Type de document
article
Présence de XML structuré
Non
Version de PDF
1.4
Score de qualité du texte
8.704
Nom du concept
  • Forbush decrease
Identifiant ISTEX
3743E85C3DBCAE4ACD9CD7D044EA5FDF3FB60A4E
ark:/67375/WNG-534L01ZW-2
Powered by Lodex 9.4.5