Latitudinal and Seasonal Variations of Quasi-Periodic and Periodic ELF-VLF Emissions

Details Latitudinal and Seasonal Variations of Quasi-Periodic and Periodic ELF-VLF Emissions Latitudinal and Seasonal Variations of Quasi-Periodic and Periodic ELF-VLF Emissions

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm42a..02h&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM42A-02

Physics

2471 Plasma Waves And Instabilities, 2731 Magnetosphere: Outer, 2736 Magnetosphere/Ionosphere Interactions, 2752 Mhd Waves And Instabilities, 2772 Plasma Waves And Instabilities

Scientific paper

We have analyzed ELF-VLF receiver and search coil magnetometer data from several Antarctic stations from 1996 through 1999 to study quasiperiodic emissions (QPs) and periodic emissions (PEs), which occur as ULF-range modulations of ELF-VLF signals between 0.5 kHz and ~4 kHz. QPs are modulated at frequencies of 20-50 mHz, and PEs are modulated at frequencies of 200-500 mHz. The five stations used covered a range of magnetic latitudes from -62° magnetic latitude (Halley) to -74° deg MLAT (South Pole Station); three automated geophysical observatories (AGOs) were located at intermediate latitudes. The two types of emissions were found to have different latitudinal, seasonal, and diurnal occurrence patterns: QPs were more likely to occur around -70° magnetic latitude while PEs occurred more often around -60° deg magnetic latitude. QPs were more common during the months of October though March, while PEs were more common during the months of May through September. QPs were most common on the day side, while PEs could be seen throughout the day. Our preliminary results suggest that most higher latitude QPs are type I events (observed with magnetic pulsations). Type II events (without simultaneous magnetic pulsations) occurred more often at lower latitudes, and most often during the months when PEs are most commonly observed. Both statistical and single event studies lend further support to recent suggestions that PEs may drive type II QPs.

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