Appleton–Hartree equation

<p>The Appleton–Hartree equation, sometimes also referred to as the Appleton–Lassen equation, is a mathematical expression that describes the <a href="/facts/Refractive_index/yjkzvgeE">refractive index</a> for <a href="/facts/Electromagnetic_wave/Ynx7ujCW">electromagnetic wave</a> propagation in a cold magnetized <a href="/facts/Plasma_(physics)/1d3btMVU">plasma</a>. The Appleton–Hartree equation was developed independently by several different scientists, including <a href="/facts/Edward_Victor_Appleton/7FfJIqz5">Edward Victor Appleton</a>, <a href="/facts/Douglas_Hartree/WKeyXHnK">Douglas Hartree</a> and German radio physicist H. K. Lassen.  Lassen's work, completed two years prior to Appleton and five years prior to Hartree, included a more thorough treatment of collisional plasma; but, published only in German, it has not been widely read in the English speaking world of radio physics.  Further, regarding the derivation by Appleton, it was noted in the historical study by Gillmor that <a href="/facts/Wilhelm_Altar/DH7bDHCX">Wilhelm Altar</a> (while working with Appleton) first calculated the dispersion relation in 1926.
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Appleton–Hartree equation open-in-new

Appleton–Hartree equation