Computer Science – Sound
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46.1159h&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Dec. 1984, p. 1159-1168.
Computer Science
Sound
1
Auroral Spectroscopy, Ion Motion, Ionospheric Sounding, Radio Probing, Autocorrelation, Eiscat Radar System (Europe), Helium Ions, Hydrogen Ions, Oxygen Ions, Positive Ions, Power Spectra
Scientific paper
During geomagnetic storms, different partial pressure gradients in the auroral ionosphere may result in H(+), He(+), O(+) and molecular ions drifting with different velocities along the earth's magnetic field line. For relative drift velocities much lower than 400 m/s, it is shown that differential ion flows may be identified by two signatures in the autocorrelation function (ACF) measured by EISCAT. For large relative drifts, numerical simulations show that these signatures still exist and may result in an asymmetry in the incoherent scatter spectrum for O(+) and molecular ions. It is demonstrated that UHF data can be reliably analyzed for Debye lengths less than about 1, but at high altitudes, where O(+) H(+) flows are expected, UHF observations will be restricted by large Debye lengths (greater than 1). Examples of ACFs based on polar wind theory are presented and discussed for the VHF system, and finally it is shown that large ion temperature ratios can significantly affect the velocity determination.
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