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    Types Pc 1-2 and IPDP micropulsations at the auroral zone

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    Author
    Heacock, Richard R.
    Keyword
    Geomagnetic micropulsations
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    URI
    http://hdl.handle.net/11122/15440
    Abstract
    A micropulsation recording program was carried out at College and Anchorage, Alaska and at Bar I, Canada, with induction magnetometers. The analysis program centered mainly on synoptic and polarization characteristic for types Pc 1-2, IPDP, and Pi burst micropulsation events. Summaries of the known morphological features for structured Pc 1 and unstructured Pc 1-2 micropulsations are given. The synoptic studies disclosed latitude relationships between unstructured Pc 1-2, IPDP, and Pi burst events. At the onset of a polar substorm, Pi bursts occur near midnight at 65°-70° geomagnetic latitudes. IPDP events follow the Pi burst and are seen in evening hours at 60°-65° latitudes. IPDP events seen in afternoon hours are often preceded by unstructured Pc 1-2 activity which maximizes a few degrees polewards of the IPDP. The IPDP events are seen in the evening “bulge” region of the plasmasphere. The proton plasma requirement for IPDP wave generation suggests that protons which are injected near midnight in the Pi burst event drift westwards into the bulge and generate unstructured Pc 1-2 and IPDPs there. The polarization characteristics of Pc 1 activity indicate that simple structured Pc 1 events originate on a stable tube of force. Unstructured Pc 1 events and events which are superpositions of several events usually display pronounced time-variability in the polarization characteristics.
    Description
    UAG R-215
    Table of Contents
    Abstract -- Table of contents -- Personnel -- Publications -- Acknowledgements -- List of illustrations -- List of tables -- 1. Introduction -- 2. Instrumentation - 2.1. A brief history of the development of techniques for recording short-period (T < 20 secs) micropulsations - 2.2. Induction magnetometer systems at Alaska sites - 2.3. Micropulsation data processing facilities at the Geophysical Institute -- 3. Micropulsation data recorded with F19628-68-C-0121 support and archived at the Geophysical Institute -- 4. Characteristics of structured Pc 1 micropulsations as observed on the ground -- 5. Characteristics of unstructured Pc 1-2 micropulsations as observed on the ground -- 6. Latitude effects in IPDP and unstructured Pc 1-2 micropulsation events - 6.1. Latitude effect between unstructured Pc 1-2 and IPDP events - 6.2. Latitude effects between Pi bursts and IPDPs - 6.3. Latitude effects within IPDP events -- 7. Polarizations of Pc 1 micropulsations - 7.1. The event of 5 January 1970 - 7.2. Polarizations in the horizontal plane at College, selected events - 7.3. Orientations of the wave normal in 3-space - 7.4. Discussion of polarization characteristics -- 8. Evidence for a midday type of particle precipitation at College - 8.1. Correlation and regression coefficients between College type Pi micropulsation activity and College ionospheric cosmic noise absorption - 8.2. CNA at times of low Kp -- 9. Recommendations for future work -- List of references.
    Date
    1971-01
    Publisher
    Geophysical Institute at the University of Alaska Fairbanks
    Type
    Report
    Collections
    GI Reports

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