The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform

Delano Gobbi - One of the best experts on this subject based on the ideXlab platform.

  • Atmospheric gravity wave Propagation Direction observed by airglow imaging in the South American sector
    Journal of Atmospheric and Solar-Terrestrial Physics, 2005
    Co-Authors: Amauri Fragoso De Medeiros, H. Takahashi, Ricardo Arlen Buriti, K.m. Pinheiro, Delano Gobbi
    Abstract:

    Abstract Airglow all sky imaging observation has been carried out in three different locations in south America, at Cachoeira Paulista (22.7°S, 45.0°W) in 1999, Sao Joao do Cariri (7.5°S, 36.5°W) in 2001 and Boa Vista (2.8°N, 60.7°W) in 2002. Comparing the atmospheric gravity wave characteristics retrieved from the image data for the three different sites and including a previous work at Alcântara (2.3°S, 44.5°W) carried out by Taylor et al. [1997. Journal of Geophysical Research 102 (D22) 26,283–26,299], we found that there is a preferential Propagation Direction, from the Continent to the Atlantic Ocean. The observed wave Propagation Directions reveal that a major part of the waves have their Direction from Continent toward Ocean. The possible source of the wave generation is discussed.

  • An investigation of gravity wave activity in the low‐latitude upper mesosphere: Propagation Direction and wind filtering
    Journal of Geophysical Research, 2003
    Co-Authors: Amauri Fragoso De Medeiros, H. Takahashi, Michael J. Taylor, Paulo Prado Batista, Delano Gobbi
    Abstract:

    horizontal phase speeds of up to � 80 m s � 1 . The large-scale ‘‘band’’ wave patterns (horizontal wavelength between 10 and 60 km) exhibited a clear seasonal dependence on the horizontal Propagation Direction, propagating toward the southeast during the summer months and toward the northwest during the winter. The Direction of Propagation was observed to change abruptly around the equinox period in mid March and at the end of September. Using a numerical simulation of gravity wave Propagation in a seasonally variable climatological wind field, we have determined that the observed anisotropy in the wave Propagation Directions can be attributed to a strong filtering of the waves in the middle atmosphere by stratospheric winds. INDEX TERMS: 0310 Atmospheric Composition and Structure: Airglow and aurora; 3332 Meteorology and Atmospheric Dynamics: Mesospheric dynamics; 3360 Meteorology and Atmospheric Dynamics: Remote sensing; KEYWORDS: airglow, winds, gravity waves, wind filtering, imager

Akihide Sano - One of the best experts on this subject based on the ideXlab platform.

Yutaka Miyamoto - One of the best experts on this subject based on the ideXlab platform.

H. Takahashi - One of the best experts on this subject based on the ideXlab platform.

  • Atmospheric gravity wave Propagation Direction observed by airglow imaging in the South American sector
    Journal of Atmospheric and Solar-Terrestrial Physics, 2005
    Co-Authors: Amauri Fragoso De Medeiros, H. Takahashi, Ricardo Arlen Buriti, K.m. Pinheiro, Delano Gobbi
    Abstract:

    Abstract Airglow all sky imaging observation has been carried out in three different locations in south America, at Cachoeira Paulista (22.7°S, 45.0°W) in 1999, Sao Joao do Cariri (7.5°S, 36.5°W) in 2001 and Boa Vista (2.8°N, 60.7°W) in 2002. Comparing the atmospheric gravity wave characteristics retrieved from the image data for the three different sites and including a previous work at Alcântara (2.3°S, 44.5°W) carried out by Taylor et al. [1997. Journal of Geophysical Research 102 (D22) 26,283–26,299], we found that there is a preferential Propagation Direction, from the Continent to the Atlantic Ocean. The observed wave Propagation Directions reveal that a major part of the waves have their Direction from Continent toward Ocean. The possible source of the wave generation is discussed.

  • an investigation of gravity wave activity in the low latitude upper mesosphere Propagation Direction and wind filtering
    Journal of Geophysical Research, 2003
    Co-Authors: A F Medeiros, H. Takahashi, Michael J. Taylor, Paulo Prado Batista, D Gobbi
    Abstract:

    horizontal phase speeds of up to � 80 m s � 1 . The large-scale ‘‘band’’ wave patterns (horizontal wavelength between 10 and 60 km) exhibited a clear seasonal dependence on the horizontal Propagation Direction, propagating toward the southeast during the summer months and toward the northwest during the winter. The Direction of Propagation was observed to change abruptly around the equinox period in mid March and at the end of September. Using a numerical simulation of gravity wave Propagation in a seasonally variable climatological wind field, we have determined that the observed anisotropy in the wave Propagation Directions can be attributed to a strong filtering of the waves in the middle atmosphere by stratospheric winds. INDEX TERMS: 0310 Atmospheric Composition and Structure: Airglow and aurora; 3332 Meteorology and Atmospheric Dynamics: Mesospheric dynamics; 3360 Meteorology and Atmospheric Dynamics: Remote sensing; KEYWORDS: airglow, winds, gravity waves, wind filtering, imager

  • An investigation of gravity wave activity in the low‐latitude upper mesosphere: Propagation Direction and wind filtering
    Journal of Geophysical Research, 2003
    Co-Authors: Amauri Fragoso De Medeiros, H. Takahashi, Michael J. Taylor, Paulo Prado Batista, Delano Gobbi
    Abstract:

    horizontal phase speeds of up to � 80 m s � 1 . The large-scale ‘‘band’’ wave patterns (horizontal wavelength between 10 and 60 km) exhibited a clear seasonal dependence on the horizontal Propagation Direction, propagating toward the southeast during the summer months and toward the northwest during the winter. The Direction of Propagation was observed to change abruptly around the equinox period in mid March and at the end of September. Using a numerical simulation of gravity wave Propagation in a seasonally variable climatological wind field, we have determined that the observed anisotropy in the wave Propagation Directions can be attributed to a strong filtering of the waves in the middle atmosphere by stratospheric winds. INDEX TERMS: 0310 Atmospheric Composition and Structure: Airglow and aurora; 3332 Meteorology and Atmospheric Dynamics: Mesospheric dynamics; 3360 Meteorology and Atmospheric Dynamics: Remote sensing; KEYWORDS: airglow, winds, gravity waves, wind filtering, imager

D Gobbi - One of the best experts on this subject based on the ideXlab platform.

  • an investigation of gravity wave activity in the low latitude upper mesosphere Propagation Direction and wind filtering
    Journal of Geophysical Research, 2003
    Co-Authors: A F Medeiros, H. Takahashi, Michael J. Taylor, Paulo Prado Batista, D Gobbi
    Abstract:

    horizontal phase speeds of up to � 80 m s � 1 . The large-scale ‘‘band’’ wave patterns (horizontal wavelength between 10 and 60 km) exhibited a clear seasonal dependence on the horizontal Propagation Direction, propagating toward the southeast during the summer months and toward the northwest during the winter. The Direction of Propagation was observed to change abruptly around the equinox period in mid March and at the end of September. Using a numerical simulation of gravity wave Propagation in a seasonally variable climatological wind field, we have determined that the observed anisotropy in the wave Propagation Directions can be attributed to a strong filtering of the waves in the middle atmosphere by stratospheric winds. INDEX TERMS: 0310 Atmospheric Composition and Structure: Airglow and aurora; 3332 Meteorology and Atmospheric Dynamics: Mesospheric dynamics; 3360 Meteorology and Atmospheric Dynamics: Remote sensing; KEYWORDS: airglow, winds, gravity waves, wind filtering, imager