REEVALUATION OF THE O+(P-2) REACTION-RATE COEFFICIENTS DERIVED FROM ATMOSPHERE EXPLORER-C OBSERVATIONS

被引:39
作者
CHANG, T
TORR, DG
RICHARDS, PG
SOLOMON, SC
机构
[1] UNIV ALABAMA, DEPT PHYS, CTR SPACE PLASMA & AERON RES, HUNTSVILLE, AL 35899 USA
[2] UNIV ALABAMA, DEPT COMP SCI, CTR SPACE PLASMA & AERON RES, HUNTSVILLE, AL 35899 USA
[3] UNIV COLORADO, ATMOSPHER & SPACE PHYS LAB, BOULDER, CO 80309 USA
关键词
D O I
10.1029/93JA00957
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
(O+(P))-P-2 is an important species for studies of the ionosphere and thermosphere: its emission at 7320 angstrom can be used as a diagnostic of the thermospheric atomic oxygen density. Unfortunately, there are no laboratory measurements of the O and N2 reaction rates which are needed to determine the major sinks of (O+(P))-P-2. The reaction rates that are generally used were determined from aeronomic data by Rusch et al. (1977) but there is evidence that several important inputs that they used should be changed. We have recalculated the O and N2 reaction rates for (O+(P))-P-2 using recent improvements in the solar EUV flux, cross sections, and photoelectron fluxes. For the standard solar EUV flux, the new N2 reaction rate of 3.4 +/- 1.5 x 10(-10) cm3s-1 is close to the value obtained by Rusch et al. (1977), but the new 0 reaction rate of 4.0 +/- 1.9 x 10(-10) cm3s-1 is about 8 times larger. These new reaction rates are derived using neutral densities, electron density, and solar EUV fluxes measured by Atmosphere Explorer C in 1974 during solar minimum. The new theoretical emission rates are in good agreement with the data for the two orbits studied by Rusch et al. and they are in reasonable agreement with data from five additional orbits that are used in this study. We have also examined the effect of uncertainties in the solar EUV flux on the derived reaction rates and found that 15 % uncertainties in the solar flux could cause additional uncertainties of up to a factor of 1.5 in the O quenching rate.
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页码:15589 / 15597
页数:9
相关论文
共 19 条
[1]   TOTAL PHOTOIONIZATION CROSS-SECTIONS OF ATOMIC OXYGEN FROM THRESHOLD TO 44.3 A [J].
ANGEL, GC ;
SAMSON, JAR .
PHYSICAL REVIEW A, 1988, 38 (11) :5578-5585
[2]   A METHOD FOR THE RETRIEVAL OF ATOMIC OXYGEN DENSITY AND TEMPERATURE PROFILES FROM GROUND-BASED MEASUREMENTS OF THE O+(2D - 2P) 7320-A TWILIGHT AIRGLOW [J].
FENNELLY, JA ;
TORR, DG ;
RICHARDS, PG ;
TORR, MR ;
SHARP, WE .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1991, 96 (A2) :1263-1273
[3]  
FENNELLY JA, 1992, ATOMIC DATA NUCLEAR, V51, P3251
[4]   VISIBLE-AIRGLOW EXPERIMENT ON ATMOSPHERE EXPLORER [J].
HAYS, PB ;
CARIGNAN, G ;
KENNEDY, BC ;
SHEPHERD, GG ;
WALKER, JCG .
RADIO SCIENCE, 1973, 8 (04) :369-377
[5]   MSIS-86 THERMOSPHERIC MODEL [J].
HEDIN, AE .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1987, 92 (A5) :4649-4662
[6]   SCATTERING OF ELECTRONS BY C N O N+ O+ AND O++ [J].
HENRY, RJW ;
BURKE, PG ;
SINFAILAM, AL .
PHYSICAL REVIEW, 1969, 178 (01) :218-+
[7]   EUV FLUX VARIATION DURING END OF SOLAR CYCLE-20 AND BEGINNING CYCLE-21, OBSERVED FROM AE-C SATELLITE [J].
HINTEREGGER, HE .
GEOPHYSICAL RESEARCH LETTERS, 1977, 4 (06) :231-234
[8]   MEASUREMENTS OF THE AMBIENT PHOTOELECTRON-SPECTRUM FROM ATMOSPHERE EXPLORER .1. AE-E MEASUREMENTS BELOW 300 KM DURING SOLAR MINIMUM CONDITIONS [J].
LEE, JS ;
DOERING, JP ;
POTEMRA, TA ;
BRACE, LH .
PLANETARY AND SPACE SCIENCE, 1980, 28 (10) :947-971
[9]   ON THE INVERSION OF O+(2D-2P) 7320-A TWILIGHT AIRGLOW OBSERVATIONS - A METHOD FOR RECOVERING BOTH THE IONIZATION FREQUENCY AND THE THERMOSPHERIC OXYGEN ATOM DENSITIES [J].
MCDADE, IC ;
SHARP, WE ;
RICHARDS, PG ;
TORR, DG .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1991, 96 (A1) :259-266
[10]   ABSOLUTE SOLAR FLUX MEASUREMENT SHORTWARD OF 575-A [J].
OGAWA, HS ;
JUDGE, DL .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1986, 91 (A6) :7089-7092