Computer Science – Sound
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa11a1565d&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA11A-1565
Computer Science
Sound
[0310] Atmospheric Composition And Structure / Airglow And Aurora, [2400] Ionosphere, [2419] Ionosphere / Ion Chemistry And Composition, [2494] Ionosphere / Instruments And Techniques
Scientific paper
Previous measurements of the 911 Å emission made by sounding rockets, at altitude less than 320 km, indicated that the emission was either very weak or non-existent. Newer measurements made by the Remote Atmospheric and Ionospheric Detection System (RAIDS) currently in operation aboard the International Space Station, at an altitude of 340 km, show the same behavior. Yet, satellite-based measurements made at altitudes above 800 km showed the emission to be present and strong enough to be accurately measured and inverted; those inversions were validated against ionosonde measurements and demonstrated the possibility of using the 911 Å emission for daytime ionospheric sensing. So the conundrum is: why do measurements made at lower altitudes (< 350 km) indicate weak or non-existent emission while satellite measurements at higher altitudes (>800 km) show the presence of the emission at the expected level? We present our measurements of the daytime and nighttime electron density derived by analysis of the O I 1356 and O I 911 Å altitude profiles measured by the Low Resolution Airglow and Aurora Spectrograph (LORAAS) instrument launched aboard the Advanced Research and Global Observation Satellite (ARGOS), which operated between mid-May 1999 and April 2002. We compare the retrieved electron density profiles inferred from the limb intensities of the ultraviolet emissions to peak heights and peak densities measured during ionosonde overflights. We show that the 911 Å emission is strongly affected by the height of the ionosphere and show that this is consistent with absorption of the 911 Å by atomic oxygen. Model results are presented showing that the RAIDS and sounding rocket measurements can be explained by this absorption.
Bishop Richard L.
Budzien Scott A.
Christensen Andrew B.
Coker Clayton
Dymond Kenneth
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