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  • Journal article
    Cargill PJ, 1999,

    , JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 104, Pages: 14647-14653, ISSN: 2169-9380
  • Journal article
    Krupp N, Dougherty MK, Woch J, Seidel R, Keppler Eet al., 1999,

    , JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 104, Pages: 14767-14780, ISSN: 2169-9380
    • Cite
    • Citations: 19
  • Journal article
    Galand M, Lilensten J, Toublanc D, Maurice Set al., 1999,

    , ICARUS, Vol: 140, Pages: 92-105, ISSN: 0019-1035
    • Cite
    • Citations: 72
  • Journal article
    Classen HT, Mann G, Forsyth RJ, Keppler Eet al., 1999,

    Low frequency plasma turbulence and high energy particles at CIR-related shock waves

    , ASTRONOMY & ASTROPHYSICS, Vol: 347, Pages: 313-320, ISSN: 0004-6361
  • Journal article
    Geer AJ, Harries JE, Brindley HE, 1999,

    , JOURNAL OF CLIMATE, Vol: 12, Pages: 1940-1955, ISSN: 0894-8755
    • Cite
    • Citations: 15
  • Journal article
    Rishbeth H, M眉ller-Wodarg ICF, 1999,

    , Annales Geophysicae, Vol: 17, Pages: 794-805

    <jats:p>Abstract. The coupled thermosphere-ionosphere-plasmasphere model CTIP is used to study the global three-dimensional circulation and its effect on neutral composition in the midlatitude F-layer. At equinox, the vertical air motion is basically up by day, down by night, and the atomic oxygen/molecular nitrogen [O/N2] concentration ratio is symmetrical about the equator. At solstice there is a summer-to-winter flow of air, with downwelling at subauroral latitudes in winter that produces regions of large [O/N2] ratio. Because the thermospheric circulation is influenced by the high-latitude energy inputs, which are related to the geometry of the Earth's magnetic field, the latitude of the downwelling regions varies with longitude. The downwelling regions give rise to large F2-layer electron densities when they are sunlit, but not when they are in darkness, with implications for the distribution of seasonal and semiannual variations of the F2-layer. It is also found that the vertical distributions of O and N2 may depart appreciably from diffusive equilibrium at heights up to about 160 km, especially in the summer hemisphere where there is strong upwelling. Atmospheric composition and structure (thermosphere · composition and chemistry) · Ionosphere (ionosphere · atmosphere interactions) </jats:p>
  • Journal article
    Toumi R, Hartell N, Bignell K, 1999,

    , GEOPHYSICAL RESEARCH LETTERS, Vol: 26, Pages: 1751-1754, ISSN: 0094-8276
    • Cite
    • Citations: 17
  • Journal article
    Bale SD, Reiner MJ, Bougeret JL, Kaiser ML, Krucker S, Larson DE, Lin RPet al., 1999,

    , GEOPHYSICAL RESEARCH LETTERS, Vol: 26, Pages: 1573-1576, ISSN: 0094-8276
    • Cite
    • Citations: 184
  • Journal article
    Rishbeth H, M眉ller-Wodarg ICF, 1999,

    , ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES, Vol: 17, Pages: 794-805, ISSN: 0992-7689
    • Cite
    • Citations: 90
  • Conference paper
    Grappin R, Mangeney A, Schwartz SJ, Feldman WCet al., 1999,

    , Pages: 329-332-329-332
  • Journal article
    Rego D, Achilleos N, Stallard T, Miller S, Prang茅 R, Dougherty M, Joseph RDet al., 1999,

    , NATURE, Vol: 399, Pages: 121-124, ISSN: 0028-0836
    • Cite
    • Citations: 59
  • Journal article
    Riley P, Gosling JT, McComas DJ, Pizzo VJ, Luhmann JG, Biesecker D, Forsyth RJ, Hoeksema JT, Lecinski A, Thompson BJet al., 1999,

    , JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 104, Pages: 9871-9879, ISSN: 2169-9380
    • Cite
    • Citations: 28
  • Journal article
    Proffitt CR, J枚nsson P, Litz茅n U, Pickering JC, Wahlgren GMet al., 1999,

    , ASTROPHYSICAL JOURNAL, Vol: 516, Pages: 342-348, ISSN: 0004-637X
    • Cite
    • Citations: 33
  • Journal article
    Linker JA, Mikic Z, Biesecker DA, Forsyth RJ, Gibson SE, Lazarus AJ, Lecinski A, Riley P, Szabo A, Thompson BJet al., 1999,

    , JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 104, Pages: 9809-9830, ISSN: 2169-9380
    • Cite
    • Citations: 308
  • Journal article
    Proffitt CR, J枚nsson P, Litz茅n U, Pickering JC, Wahlgren GMet al., 1999,

    , Astrophysical Journal, Vol: 516, Pages: 342-348, ISSN: 0004-637X

    Boron abundances and isotope ratios in two early B stars have been measured by using the Hubble Space Telescope's Goddard High-Resolution Spectrograph (GHRS) in order to observe the B III resonance doublet near 2066 Å. We also report new experimental and theoretical results for the wavelengths, isotope shift, and hyperfine structure of these boron lines. In HD 886 (γ Pegasi; B2 IV), and HD 35299 (B1 V) the abundance of boron is about a factor of 2 lower than that inferred from solar system meteorites. The <sup>11</sup>B/<sup>10</sup>B isotope ratio in HD 886 is determined to be 4.7<sup>+1.1</sup><inf>-1.0</inf>, and for HD 35299 a value of 3.7<sup>+0.8</sup>-<inf>0.6</inf> is found. These values are consistent with the solar system isotope ratio. In a third star, HD 3360 (ζ Cassiopeiae; B2 IV), our GHRS observations show that the boron abundance is a factor of 40 below the solar system abundance. Our results for HD 886 and HD 35299 appear to be consistent with little dispersion in the initial boron-to-oxygen ratio among Population I stars and a universal <sup>11</sup>B/<sup>10</sup>B isotope ratio. However, the abundance measured for HD 3360 shows that either some stars suffer significant boron depletion while still in the core-hydrogen burning phase of their evolution, or there is indeed a very wide variation in initial Population I boron abundances. A much-improved understanding of boron astration in early B stars will be required before this question can be resolved.
  • Journal article
    Kellogg PJ, Goetz K, Monson SJ, Bale SDet al., 1999,

    , JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 104, Pages: 6751-6757, ISSN: 2169-9380
    • Cite
    • Citations: 26
  • Journal article
    Kernthaler SC, Toumi R, Haigh JD, 1999,

    , GEOPHYSICAL RESEARCH LETTERS, Vol: 26, Pages: 863-865, ISSN: 0094-8276
    • Cite
    • Citations: 81
  • Journal article
    Funsten HO, Gosling JT, Riley P, St Cyr OC, Forsyth RJ, Howard RA, Schwenn Ret al., 1999,

    , JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 104, Pages: 6679-6689, ISSN: 2169-9380
    • Cite
    • Citations: 19
  • Journal article
    Desai MI, Marsden RG, Sanderson TR, Lario D, Roelof EC, Simnett GM, Gosling JT, Balogh A, Forsyth RJet al., 1999,

    , JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 104, Pages: 6705-6719, ISSN: 2169-9380
    • Cite
    • Citations: 39
  • Journal article
    Haigh JD, 1999,

    , QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, Vol: 125, Pages: 871-892, ISSN: 0035-9009
    • Cite
    • Citations: 143
  • Journal article
    Zhong WY, Haigh JD, 1999,

    , QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, Vol: 125, Pages: 1383-1406, ISSN: 0035-9009
  • Journal article
    Bale SD, 1999,

    , GEOPHYSICAL RESEARCH LETTERS, Vol: 26, Pages: 667-670, ISSN: 0094-8276
    • Cite
    • Citations: 14
  • Journal article
    Balogh A, Forsyth RJ, Lucek EA, Horbury TS, Smith EJet al., 1999,

    , GEOPHYSICAL RESEARCH LETTERS, Vol: 26, Pages: 631-634, ISSN: 0094-8276
    • Cite
    • Citations: 113
  • Journal article
    Galand M, Richmond AD, 1999,

    , JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 104, Pages: 4447-4455, ISSN: 2169-9380
    • Cite
    • Citations: 26
  • Journal article
    Sibeck DG, Borodkova NL, Schwartz SJ, Owen CJ, Kessel R, Kokubun S, Lepping RP, Lin R, Liou K, L眉hr H, McEntire RW, Meng C-I, Mukai T, Nemecek Z, Parks G, Phan TD, Romanov SA, Safrankova J, Sauvaud J-A, Singer HJ, Solovyev SI, Szabo A, Takahashi K, Williams DJ, Yumoto K, Zastenker GNet al., 1999,

    , \jgr, Vol: 104, Pages: 4577-4594-4577-4594
  • Journal article
    Chisham G, Schwartz SJ, Balikhin MA, Dunlop MWet al., 1999,

    , JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 104, Pages: 437-447, ISSN: 2169-9380
    • Cite
    • Citations: 39
  • Conference paper
    Rufus J, Pickering J, Thorne A, Cox G, Stark G, Smith PLet al., 1999,

    Molecular absorption cross-section measurements by FTS in the UV

    , Pages: 122-123
  • Conference paper
    Pickering JC, Thome AP, Cox G, Nave G, Smith PLet al., 1999,

    Fourier Transform Spectrometry of Doubly Ionized Atoms

    , Pages: 31-33

    This project has shown that with the extension of the VUV range of the IC FT spectrometer down to 140nm and a Penning light source, the urgently needed improvements in accuracy of the laboratory atomic data for doubly ionized species are now possible. An extensive study of Fe III is in progress and will be followed by other studies of doubly charged transition group ions, e.g., Ni III and Mn III. This work was supported by NASA Grant NAGW-4888 to Harvard University, by the Paul Instrument Fund of the Royal Society, by an SAO Innovative 91桃色 & Development Grant, a NATO grant for International Collaboration in 91桃色, by PPARC of the UK, and by the Royal Society. The authors gratefully acknowledge the advice and assistance of, R. Kling, M. Kock, C. Heise, R. C. M. Learner, W. Mende, W. H. Parkinson, and particularly D. S. Leckrone.
  • Journal article
    Lockwood M, Stamper R, Wild MN, Balogh A, Jones Get al., 1999,

    , Astronomy and Geophysics, Vol: 40, Pages: 410-416, ISSN: 1366-8781

    Stellar astronomy tells us much about the long-term evolution of our Sun while forensic evidence (for example, cosmic-ray products in ice cores) gives us indications of its fluctuations over the last millennium. However, such studies do not give us a sufficiently detailed understanding of solar change over the last century to allow us to detect and quantify any role that the Sun might have played in the observed rise in average surface temperatures on Earth. This paper describes recent research that has filled this gap by applying advances in our understanding of the effects and structure of the solar wind to historical data on the Earth's magnetic field.
  • Journal article
    Jones GH, Balogh A, Horbury TS, 1999,

    , GEOPHYSICAL RESEARCH LETTERS, Vol: 26, Pages: 13-16, ISSN: 0094-8276
    • Cite
    • Citations: 19

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