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An investigation of the frequency shift mechanisms of IPDP type pulsations

University of British Columbia

Possible freguency shift mechanisms for IPDP micropulsation events are examined here. Micropulsation data collected from a north - south chain of stations in British Columbia is used for this study, along with normal-run magnetograms obtained from observatories near this chain, from eguatorial observatories, and from observatories to the east of the chain. Four theories proposing to explain the IPDP freguency shift have been advanced; the inward motion theory, the azimuthal drift theory, the increasing field theory, and the decreasing plasma density theory. It is found that two of these mechanisms, as described in the inward motion and azimuthal drift theories, can, acting together, account for the observed frequency shift in the events detected on the B.C.chain. The greater part of the frequency rise in these events is produced by the inward motion mechanism. It is also noted that the ionospheric duct strongly affects the propagation of the IPDP hydromagnetic waves through the upper atmosphere.

Text

2010-03-19

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http://hdl.handle.net/2429/22155

Astronomy

University of British Columbia

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