Zobrazeno 1 - 10
of 175
pro vyhledávání: '"J M Forbes"'
Publikováno v:
Geophysical Research Letters, Vol 51, Iss 6, Pp n/a-n/a (2024)
Abstract The variability of Mars exosphere over monthly to solar‐cycle scales at 251 and 412 km altitude is quantified by analysis of 41‐Ls mean densities derived from precise orbit determination of the Mars Reconnaissance Orbiter (MRO) and Mars
Externí odkaz:
https://doaj.org/article/f366cdaca6f54a82accc598fbe0ef1a5
Autor:
Y. I. Portnyagin, T. V. Solovjova, N. A. Makarov, E. G. Merzlyakov, A. H. Manson, C. E. Meek, W. Hocking, N. Mitchell, D. Pancheva, P. Hoffmann, W. Singer, Y. Murayama, K. Igarashi, J. M. Forbes, S. Palo, C. Hall, S. Nozawa
Publikováno v:
Annales Geophysicae, Vol 22, Pp 3395-3410 (2004)
The Arctic MLT wind regime parameters measured at the ground-based network of MF and meteor radar stations (Andenes 69° N, Tromsø 70° N, Esrange 68° N, Dixon 73.5° N, Poker Flat 65° N and Resolute Bay 75° N) are discussed and compared with
Externí odkaz:
https://doaj.org/article/58515243c7cd46fca6bb905a61db43c7
Autor:
J. M. Forbes, Yu. I. Portnyagin, W. Skinner, R. A. Vincent, T. Solovjova, E. Merzlyakov, T. Nakamura, S. Palo
Publikováno v:
Annales Geophysicae, Vol 22, Pp 1931-1945 (2004)
Comparisons are made between climatological dynamic fields obtained from ground-based (GB) and space-based (SB) instruments with a view towards identifying SB/GB intercalibration issues for TIMED and other future aeronomy satellite missions. SB me
Externí odkaz:
https://doaj.org/article/791ef09acccf43edad3a6afe6da891cc
Autor:
E. Merzlyakov, D. Pancheva, N. Mitchell, J. M. Forbes, Yu. I. Portnyagin, S. Palo, N. Makarov, H. G. Muller
Publikováno v:
Annales Geophysicae, Vol 22, Pp 773-788 (2004)
Results from the analysis of MLT wind measurements at Dixon (73.5°N, 80°E), Esrange (68°N, 21°E), Castle Eaton (UK) (53°N, 2°W), and Obninsk (55°N, 37°E) during summer 2000 are presented in this paper. Using S-transform or wavelet analysis,
Externí odkaz:
https://doaj.org/article/1558aafecd8a45c19e75898065f6086f
Publikováno v:
Annales Geophysicae, Vol 18, Pp 547-554 (2000)
The first meteor radar measurements of meridional winds in the lower thermosphere (about 95 ± 5 km), along four azimuth directions: 0°, 90°E, 180° and 90°W; approximately 2° from the geographic South Pole were made during two observational c
Externí odkaz:
https://doaj.org/article/b3dc2b0714e5420d8bab2eee6bf130de
Autor:
L. N. Carter, J. M. Forbes
Publikováno v:
Annales Geophysicae, Vol 17, Pp 190-209 (1999)
A numerical model has been developed which is capable of simulating all phases of the life cycle of metallic ions, and results are described and interpreted herein for the typical case of Fe+ ions. This cycle begins with the initial deposition of
Externí odkaz:
https://doaj.org/article/5bc79a6d4e8e455a89b4c481eb7d0f4d
Publikováno v:
Annales Geophysicae, Vol 16, Pp 1486-1500 (1998)
Observations of the horizontal wind field over the South Pole were made during 1995 using a meteor radar. These data have revealed the presence of a rich spectrum of waves over the South Pole with a distinct annual occurrence. Included in this spe
Externí odkaz:
https://doaj.org/article/5a0237e78c90489194d4f8e8c5a09b49
Publikováno v:
Annales Geophysicae, Vol 16, Pp 828-837 (1998)
Meteor radar measurements of winds near 95 km in four azimuth directions from the geographic South Pole are analyzed to reveal characteristics of the 12-h oscillation with zonal wavenumber one (s=1). The wind measurements are confined to the perio
Externí odkaz:
https://doaj.org/article/c54f36bc74684e0598bb30b9c031374c
Publikováno v:
Annales Geophysicae, Vol 15, Pp 1176-1186 (1997)
We explore tropospheric latent heat release as a source of variability of the diurnal tide in the mesosphere and lower thermosphere (MLT) in two ways. First, we present analyses of the UARS WINDII horizontal wind data, which reveal signatures of n
Externí odkaz:
https://doaj.org/article/1bfc4f9685c840a9992cbd0d7996be09
Publikováno v:
Annales Geophysicae, Vol 15, Pp 1165-1175 (1997)
Latent heat release associated with tropical deep convective activity is investigated as a source for migrating (sun-synchronous) diurnal and semidiurnal tidal oscillations in the 80–150-km height region. Satellite-based cloud brightness tempera
Externí odkaz:
https://doaj.org/article/1105ff86ce224dadad3c1b727f797d66