Computer Science
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24..705r&link_type=abstract
Planetary and Space Science, vol. 24, July 1976, p. 705-710.
Computer Science
2
Auroral Zones, Cosmic Noise, Electromagnetic Absorption, Geomagnetic Micropulsations, Ionospheric Currents, Correlation Coefficients, Ionospheric Electron Density, Magnetic Signatures, Magnetometers, Riometers
Scientific paper
Cosmic noise absorption (c.n.a.) pulsation events observed with fast response riometers at Macquarie Island in the southern auroral zone have almost always been accompanied by Pi 1 micropulsations. A cross-spectral analysis of fast response riometer data and vertical component induction magnetometer data for one such event showed that, after the low frequency components are removed, the absorption is better correlated with the absolute value of the field than with the recorded charge of the absolute value of the field with time. Many of the pulsations in Z(t) show a similar time asymmetry to that commonly observed in c.n.a. pulsations: a more rapid onset time than decay time. These results indicate that the Pi 1 micropulsations observed from the ground during the recovery phase of an auroral substorm are brought about by fluctuations in the ionospheric currents which give rise to the magnetic bay, these fluctuations being due to conductivity changes resulting from particle precipitation. The lag between absorption and absolute value of the field is attributed to the self-inductance of the electrojet.
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