Die Ausbreitung Langer Wellen
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Dieses Buch verdankt seine Entstehung meiner mehrjährigen Tätigkeit auf dem Gebiet der elektromagnetischen Wellenausbreitung in der Ionosphäre. Seine Gestalt erhielt es durch Vorlesungen, die ich an der Technischen Universität Berlin und an der Universität Bonn gehalten habe. Naturgemä nehmen die Ergebnisse eigener Arbeiten einen verhältnismä ig breiten Raum ein. Jedoch habe ich mich bemüht, die Theorie der Ausbreitung langer Wellen im Rahmen des begrenzten Umfanges dieses Buches möglichst vollständig darzustellen. Manche Dinge sind dabei gestreift oder sogar nur erwähnt worden. Das betrifft unter anderem die Ableitung der So m m e - fe I d' scken Theorie der Dipolstrahlung über der leitenden ebenen Erde oder die va n der Pol - B rem m e r - Theorie der Wellenausbreitung über der gekrümmten Erde, deren Ergebnisse ohne Beweis als Ausgangspunkt für weitere Entwicklungen hingeschrieben wurden. Näheres darüber findet man in den Büchern von Sommerfeld [23] und Bremmer [7]. Auf geschlos- sene Lösungen der Wellenausbreitung in einer durch analytische Funktionen approximierten Modellionosphäre wurde ganz verzichtet. Diese sind in dem ausgezeichneten Buch von B u d den [9] in aller Vollständigkeit enthalten. Ebenso wurde die Mode-Theorie im gekrümmten Wellenleiter relativ kurz behandelt. Das inhaltsreiche Buch von W a i t [24] gibt darüper erschöpfende Auskunft. Zweck dieses Buches soll es sein, eine Brücke zwischen der reinen Theorie der Wellenausbreitung und den Bedürfnissen der praktisch arbeitenden Iono- sphärenphysiker, Nachrichtentechniker und Meteorologen zu schlagen, die die Wellenausbreitung physikalisch verstehen wollen und gebrauchsfertige Formeln für ihre Untersuchungen wünschen.
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