Metal Ion Morphology Observed by the ISAAC Instrument

Details Metal Ion Morphology Observed by the ISAAC Instrument Metal Ion Morphology Observed by the ISAAC Instrument

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa62a06d&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA62A-06

Physics

0310 Airglow And Aurora, 0335 Ion Chemistry Of The Atmosphere (2419, 2427), 2415 Equatorial Ionosphere, 2443 Midlatitude Ionosphere

Scientific paper

We present middle ultraviolet spectra between 1800 and 2900 Å showing the presence of several spectral lines due to emission by singly ionized iron and magnesium. The ionized iron lines near 2380 and 2600 Å lines are newly identified in the Earth's middle ultraviolet dayglow spectrum. We also present altitude versus latitude maps of the Fe+ and Mg+ emissions showing fountain effect upwelling near the geomagnetic equator. Ion upwelling is also observed near both poles. This upwelling is attributed to an of Ex B drift due to antisunward convection over the polar cap [Grebowsky et al., GRL, 5, 791-794, 1978; Grebowsky and Pharo, Planetary and Space Science, 33, 807-815, 1985; Kumar and Hanson, JGR, 85, 6,783-6,801, 1980], rather than Joule heating. Layers of ions, confined to narrow altitude ranges, are also observed. These layers extend continuously from +/-15° magnetic latitude to +/-60° latitude. Several parallel layers are observed; these layers start at approximately 100 km altitude and are separated by approximately 50 km. A subsequent talk will present model results showing good qualitative agreement between the low latitude portions of these maps and calculations made using the SAMI-2 [Huba et al., JGR, 105, 23035-23054, 2000] model, which includes the fountain effect.

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