DOI Prefix : 10.9780 | Journal DOI : 10.9780/22307850
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Volume : III, Issue : XI, December - 2013

Oscillations With Periods Outside The Micropulsation Range, V arious Auroral Zone And Typical Micropulsation Period Bands

Hanumantha Raju N

DOI : 10.9780/22307850, Published By : Laxmi Book Publication

Abstract :

Conspicuous micropulsations in the auroral zones with periods fr om 0.03 to 10 seconds have been studied using data obtained by the Pacific Naval Laboratory and Stanford University during January 1961. For periods less than 0.3 second bursts of oscillations fr equently occur superimposed on the background level of ELF noise. These bursts are considered to be of extra-atmospheric origin because of their conjugate relationships. For periods between 0.3 and 10 seconds four typical classes are defined: (1) Burstlike micropulsations, with quite a wide range of fr equencies, which appear at the onset of a polar storm or bay (noise burst). (2) Pearl, beating-type micropulsations, occurring intermittently so that they form separate bunches (PP). (3) Continuous micropulsations, typically found in the for enoon, with periods fr om 0.3 to 3 seconds (CPsp). (4) Continuous micropulsations, typically found in the afternoon, with periods fr om 3 to 10 seconds (CPlp). Not every polar storm or bay is accompanied by noise bursts. Noise bursts are found only at the onset of polar storms or bays occurring around or before local midnight. Separate bunches of pearl, beating-type micropulsations are attributed to a bouncing agent whose bouncing period of a few minutes can be determined fr om the time lag of their occurrences in conjugate areas.

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Hanumantha Raju N, (2013). Oscillations With Periods Outside The Micropulsation Range, V arious Auroral Zone And Typical Micropulsation Period Bands. Indian Streams Research Journal, Vol. III, Issue. XI, DOI : 10.9780/22307850,

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