Polar cap absorption events: Difference between revisions

Latest revision as of 20:26, 14 August 2018

polar cap absorption events

(Abbreviated PCA events.) A condition in the polar ionosphere where HF and VHF radio waves are absorbed and LF and VLF radio waves are reflected at lower altitudes than normal. PCA events usually originate from major solar storms that launch energetic protons that reach our outer atmosphere quickly and cause excess ionization that distorts the normal refractive properties of the polar ionosphere.

Term edited 14 August 2018.

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-== polar cap absorption event ==
+== polar cap absorption events ==
-<div class="definition"><div class="short_definition">(Abbreviated PCA event.) A condition in the polar [[ionosphere]] where [[Hf|HF]] and [[Vhf|VHF]] [[radio waves]] are absorbed and [[Lf|LF]] and [[Vlf|VLF]] [[radio waves]] are reflected at lower altitudes than normal. PCA events usually originate from major solar storms that launch energetic [[proton|protons]] that reach our [[outer atmosphere]] quickly and cause excess [[ionization]] that distorts the normal refractive properties of the polar ionosphere.</div><br/> </div>
+<div class="definition"><div class="short_definition">(Abbreviated PCA events.) A condition in the polar [[ionosphere]] where [[Hf|HF]] and [[Vhf|VHF]] [[radio waves]] are absorbed and [[Lf|LF]] and [[Vlf|VLF]] [[radio waves]] are reflected at lower altitudes than normal. PCA events usually originate from major solar storms that launch energetic [[proton|protons]] that reach our [[outer atmosphere]] quickly and cause excess [[ionization]] that distorts the normal refractive properties of the polar ionosphere.</div><br/> </div>
 <p>''Term edited 14 August 2018.''</p>