North-south asymmetry of the amplitude of high-latitude Pc 3-5 pulsations: Observations at conjugate stations

Details North-south asymmetry of the amplitude of high-latitude Pc 3-5 pulsations: Observations at conjugate stations North-south asymmetry of the amplitude of high-latitude Pc 3-5 pulsations: Observations at conjugate stations

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11010214o&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A10, CiteID A10214

Physics

1

Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934), Magnetospheric Physics: General Or Miscellaneous

Scientific paper

The north-south asymmetry of the amplitude of ULF pulsations in the Pc 3-5 band is studied using magnetic field data from the magnetically conjugate stations at L ~ 5.4: Kotzebue (KOT) in the northern hemisphere and Macquarie Island (MCQ) in the southern hemisphere. We obtained the following results for the northward (H) component of magnetic pulsations: (1) The north to south power ratio shows a maximum in the northern winter and a minimum in the northern summer. This ``seasonal variation'' is stronger at higher frequencies (Pc 3 and Pc 4 frequencies). (2) The north to south power ratio for the Pc 4 and Pc 5 frequency band is basically greater than 1.0 for all seasons. This ``positive offset'' is stronger at lower frequencies. The ``seasonal variation'' implies that the magnetohydrodynamic (MHD) waves incident from the magnetosphere are more strongly shielded when the ionospheric conductivity is higher. The ``positive offset'' may result from the difference of the background magnetic field intensity between KOT and MCQ.

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