Greater than 0.1-Hz ULF magnetic pulsations measured at South Pole, Antarctica

Details Greater than 0.1-Hz ULF magnetic pulsations measured at South Pole, Antarctica Greater than 0.1-Hz ULF magnetic pulsations measured at South Pole, Antarctica

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.5700a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, May 1, 1986, p. 5700-5710.

Physics

12

Antarctic Regions, Geomagnetic Pulsations, Magnetic Variations, Diurnal Variations, Histograms, Interplanetary Magnetic Fields, Kp Index, Polarization Characteristics, Very Low Frequencies

Scientific paper

South Pole pulsation activity at frequencies greater than 0.1 Hz is analyzed and found to consist predominantly of large-amplitude, irregular pulsations (Pi 1) closely correlated with overhead auroral activity. These pulsations therefore have two diurnal maxima related to the substorm polar expansion nightside aurora and cusp or dayside aurora. The dependence of this magnetic nightside Pi activity at South Pole on Kp and interplanetary magnetic field parameters is consistent with a strong substorm correlation. The nightside Pi is often of large amplitude than the dayside Pi and appears in bursts of pulsations having 5 to 20 min duration. The burst-like character arises because of the rapid poleward expansion of discrete auroral forms from the nightside auroral oval (evident in the slit camera data). Seasonal and local time variations of the phenomena between the opposite hemispheric stations may help in mapping the topology of that part of the geotail responsible for the high-latitude aurora. One third of the hours in which structured, band-limited pulsations (Pc 1) are observed at Siple also contain Pc 1 observed at South Pole.

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