{"id":146,"date":"2018-12-08T01:32:49","date_gmt":"2018-12-08T01:32:49","guid":{"rendered":"http:\/\/burnhamradioclub.co.uk\/?page_id=146"},"modified":"2019-10-24T21:27:44","modified_gmt":"2019-10-24T20:27:44","slug":"hf-propagation","status":"publish","type":"page","link":"https:\/\/burnhamradioclub.co.uk\/index.php\/transmission-modes\/hf-propagation\/","title":{"rendered":"Propagation"},"content":{"rendered":"

Ionosphere-and-Magnetosphere<\/a><\/h2>\n

“The\u00a0ionosphere<\/b><\/a>\u00a0(\/a\u026a<\/span>\u02c8<\/span>\u0252<\/span>n<\/span>\u0259<\/span>\u02cc<\/span>s<\/span>f<\/span>\u026a\u0259r<\/span>\/<\/a><\/span><\/span>[1]<\/a><\/sup>[2]<\/a><\/sup>) is the ionized part of Earth’s upper\u00a0atmosphere<\/a>, from about 60\u00a0km (37\u00a0mi) to 1,000\u00a0km (620\u00a0mi) altitude, a region that includes the\u00a0thermosphere<\/a>\u00a0and parts of the\u00a0mesosphere<\/a>\u00a0and\u00a0exosphere<\/a>. The ionosphere is\u00a0ionized<\/a>\u00a0by solar radiation. It plays an important role in\u00a0atmospheric electricity<\/a>\u00a0and forms the inner edge of the\u00a0magnetosphere<\/a>. It has practical importance because, among other functions, it influences\u00a0radio propagation<\/a>\u00a0to distant places on the\u00a0Earth<\/a><\/p>\n

Eugene Parker<\/a>\u00a0proposed the idea of the\u00a0solar wind<\/a>, with the term ‘magnetosphere<\/a>‘ being proposed by\u00a0Thomas Gold<\/a>\u00a0in 1959 to explain how the solar wind interacted with the Earth’s magnetic field. The later mission of Explorer 12 in 1961 led by the Cahill and Amazeen observation in 1963 of a sudden decrease in magnetic field strength near the noon-time meridian, later was named the\u00a0magnetopause<\/a>. By 1983, the\u00a0International Cometary Explorer<\/a>observed the magnetotail, or the distant magnetic field.”<\/p>\n

<\/a><\/h1>\n

<\/h1>\n

<\/a><\/h1>\n

Live solar data<\/h1>\n

Information from N0NBH<\/a><\/p>\n


\n<\/a><\/center>

\n<\/a><\/center>You can also see solar images at the\u00a0NASA website<\/a>.<\/p>\n

\"ITURHFProp\"\u00a0 \u00a0G4FKH\u2019s new propagation predictions tool Click the button below to start the application.<\/h1>\n