Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..813i&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 8, April 24, 1992, p. 813-816.
Physics
5
Emission Spectra, Magnetic Storms, Nightglow, Temperate Regions, Tropical Regions, Ultraviolet Spectra, Oxygen Atoms, Particle Precipitation, Ring Currents, Spectrum Analysis
Scientific paper
Satellite observations of the Lyman-Birge-Hopfield (LBH) band and NI line (1493 and 1744 A) emissions in the D-Mid spectra are reported which provide evidence of particle precipitation in the mid and low latitudes during the main phase of a major geomagnetic storm. A distinct characteristic of D-Mid is an extremely low intensity ratio of N2 molecular LBH band emissions to the line emissions. Laboratory cross-section measurements of keV protons and hydrogen atoms on N2 support the concept that energetic heavy-particle (H, He, and O) precipitation produces the observed low ratio of the LBH band system emission to the NI line emissions. It is concluded that the precipitation of energetic heavy particles, most likely atomic oxygen, is the major cause of the emissions observed in mid and low latitudes during the storm.
Huffman Robert E.
Ishimoto Michi
Meng Ching I.
Paxton Larry J.
Romick Gerald J.
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