Portal de Periódicos da CAPES

Diurnal variation of neutral and charged particle temperatures in the equatorial F region

1969; American Geophysical Union; Volume: 74; Issue: 1 Linguagem: Inglês

10.1029/ja074i001p00279

2156-2202

J. P. McClure,

Gas Dynamics and Kinetic Theory

Journal of Geophysical Research (1896-1977)Volume 74, Issue 1 p. 279-291 Diurnal variation of neutral and charged particle temperatures in the equatorial F region J. P. McClure, J. P. McClureSearch for more papers by this author J. P. McClure, J. P. McClureSearch for more papers by this author First published: 1 January 1969 https://doi.org/10.1029/JA074i001p00279Citations: 63AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Thomson scatter electron and ion temperature (Te and Ti) profiles from Jicamarca, Peru, near the magnetic equator are discussed. The temperature of the neutral atmosphere (Tn) can easily be deduced from Te and Ti measurements made near the equator because Te - Tn is small (near 0°K at night; near 100°K around 400 km by day). The diurnal variation of Te and hence of Tn at 400 km is as follows: Te increases at an almost constant rate of about 16°K/hr from about 0800 to 1600 hr, then decreases rapidly near sunset. It decreases at an almost constant rate of about 10°K/hr from about 2100 hr until sunrise. The diurnal variations of Qei, the electron-ion heat transfer rate, are found to be consistent with the Tn variations deduced; e.g., the measured Qei, which is approximately proportional to n(O) at 300 km, reaches a maximum about 1600 hr, as does Tn. Daytime Te and Ti values are nearly equal and constant over an altitude range of 100 to 200 km near and above the electron concentration (Ne) maximum. Theory predicts Te - Ti will decrease, and Ti - Tn will increase with height, with Te nearly constant, if the Ne profile is as broad as usual near the magnetic equator. Nighttime Te and Ti values are nearly equal and constant over the 200- to 1000-km altitude range. Thus the nighttime heat input is unmeasurably small, less than a few ev/cm³ sec in the equatorial F region. References Banks, M., Collision frequencies and energy transfer: Ions, Planetary Space Sci., 14, 1105, 1966. Brace, L. H., H. G. Mayr, B. M. Reddy, The early effects of increasing solar activity upon the temperature and density of the 1000 km ionosphere, J. Geophys. Res., 73, 1607, 1968. Brace, L. H., B. M. Reddy, H. G. Mayr, Global behavior of the ionosphere at 1000kilometers altitude, J. Geophys. Res., 72, 265, 1967. Brace, L. H., N. W. Spencer, A. Dalgarno, Detailed behavior of the midlatitude ionosphere from Explorer 17 satellite, Planetary Space Sci., 13, 647, 1965. Carru, H., M. Petit, Waldteufel, Measures de températures électroniques et ioniques par diffusion incohérente, J. Atmospheric Terrest. Phys., 29, 351, 1967a. Carru, H., M. Petit, Waldteufel, On the diurnal variation of the thermopause temperature, Planetary Space Sci., 15, 944, 1967b. , CIRA, COSPAR International Reference Atmosphere, North-Holland Publishing Co., Amsterdam, 1965. Dalgarno, A., T. P. Degges, Electron cooling in the upper atmosphere, Planetary Space Sci., 16, 125, 1968. Dalgarno, A., M. B. McElroy, R. J. Moffett, Electron temperatures in the ionosphere, Planetary Space Sci., 11, 463, 1963. Dalgarno, A., M. B. McElroy, J. C. G. Walker, The diurnal variation of ionospheric temperatures, Planetary Space Sci., 15, 331, 1967. Evans, J. V., Ionospheric backscatter observations at Millstone Hill, Planetary Space Sci., 13, 1031, 1965. Evans, J. V., M. Loewenthal, Ionospheric backscatter observations, Planetary Space Sci., 12, 915, 1964. Evans, J. V., Electron temperature and ion composition in the F1 region, J. Geophys. Res., 72, 3343, 1967. Farley, D. T., J. P. McClure, D. L. Sterling, J. L. Green, Temperature and composition of the equatorial ionosphere, J. Geophys. Res., 72, 5837, 1967. Geisler, J. E., S. A. Bowhill, Ionospheric temperatures at sunspot minimum, J. Atmospheric Terrest. Phys., 27, 457, 1965. Hanson, W. B., Electron temperature in the upper atmosphere, Space Res., 3, 282, 1963. Hanson, W. B., R. Cohen, Photoelectron heating efficiency in the ionosphere, J. Geophys. Res., 73, 831, 1968. Hanson, W. B., F. S. Johnson, Electron temperatures in the ionosphere, Mém. Soc. Roy. Sci. Liège, 4, 390, 1961. Harris, I., W. Priester, Heating of the upper atmosphere, Space Res., 3, 53, 1963. Jacchia, L., Static diffusion models of the upper atmosphere with empirical temperature profiles, Smithsonian Contrib. Astrophys., 8, 215, 1965. Johnson, C. Y., Ionospheric composition and density from 90 to 1200 kilometers at solar minimum, J. Geophys. Res., 71, 330, 1966. Nisbet, J. S., Neutral atmospheric temperatures from incoherent scatter observations, J. Atmospheric Sci., 24, 586, 1967. Citing Literature Volume74, Issue1Space Physics1 January 1969Pages 279-291 ReferencesRelatedInformation