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Titolo:
INFERENCE OF ATOMIC OXYGEN CONCENTRATION FROM REMOTE-SENSING OF OPTICAL AURORA
Autore:
SHEPHERD MG; MCCONNELL JC; TOBISKA WK; GLADSTONE GR; CHAKRABARTI S; SCHMIDTKE G;
Indirizzi:
YORK UNIV,CTR RES EARTH & SPACE SCI,4700 KEELE ST TORONTO ON M3J 1P3 CANADA NATL RES COUNCIL CANADA,HERZBERG INST ASTROPHYS OTTAWA ON K1A 0R6 CANADA TELOS,JET PROPULS LAB PASADENA CA 00000 SW RES INST SAN ANTONIO TX 00000 BOSTON UNIV,CTR SPACE PHYS BOSTON MA 02215 INST PHYS MESSTECH W-7800 FREIBURG GERMANY
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A9, volume: 100, anno: 1995,
pagine: 17415 - 17428
SICI:
2169-9380(1995)100:A9<17415:IOAOCF>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-IMPACT EXCITATION; ENERGY BUDGET CAMPAIGN; B RED AURORA; CROSS-SECTIONS; LOWER THERMOSPHERE; SATELLITE MEASUREMENTS; HIGH-LATITUDE; DISSOCIATIVE RECOMBINATION; ROCKET MEASUREMENTS; NEUTRAL ATMOSPHERE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
64
Recensione:
Indirizzi per estratti:
Citazione:
M.G. Shepherd et al., "INFERENCE OF ATOMIC OXYGEN CONCENTRATION FROM REMOTE-SENSING OF OPTICAL AURORA", J GEO R-S P, 100(A9), 1995, pp. 17415-17428

Abstract

A remote sensing method has been developed for the determination of the [O]/[O-MSIS] ratio in aurora, using ratios of the O I (557.7 nm) and N-2(+) (391.4 nm) emissions, It is shown that the method can be usedfor the analysis of measurements integrated along the line of sight, provided data only above the emission rate peak are used. The method is applied to the case of horizontal viewing from a vertically orientedrocket so that a large volume of space was sampled around the rocket,The method can potentially be applied to satellite limb images, provided some independent information about the location of the aurora is available, as it was for the rocket observations, Photometric measurements of the N-2(+) (391.4 nm) and O I (557.7 nm) emissions obtained during the Energy Budget Campaign 1980 on flight E-2 with the instrument EF11 and its reflight in 1981 were used in the analysis presented, During the first flight the rocket horizontally viewed two distinct aurorae, a nearby diffuse patch, and a more distant pulsating aurora, Results obtained by the same EF11 instrument on a second flight through an auroral are in 1981 are also presented, Two types of atomic oxygen variability were found in both of the flights. In the first type, [O] is increased above [O-MSIS] by a factor of 1.5 at 180 km, is equal to theMSIS model at 160 km, and is less than MSIS below that; that is, the scale height of[O] was increased. The experimental I(557.7)/I(391.4) ratio was constant with altitude, In the second type, the [O] was depleted by about a factor of 2 over tile altitude range of 120-180 km, while the 1(557.7)/I(391.4) ratio decreased with altitude. The inferred atomic oxygen concentrations of 0.5 to 2 with respect to MSIS suggesteddifferent vertical flows on the two cases, Independent evidence is provided by atmospheric composition measurements made during the same campaign.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 10:02:17