Journal metrics

Journal metrics

  • IF value: 1.621 IF 1.621
  • IF 5-year value: 1.614 IF 5-year 1.614
  • CiteScore value: 1.61 CiteScore 1.61
  • SNIP value: 0.900 SNIP 0.900
  • SJR value: 0.910 SJR 0.910
  • IPP value: 1.58 IPP 1.58
  • h5-index value: 24 h5-index 24
  • Scimago H index value: 80 Scimago H index 80
Ann. Geophys., 27, 461-472, 2009
https://doi.org/10.5194/angeo-27-461-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
02 Feb 2009
Characteristics of mesospheric gravity waves near the magnetic equator, Brazil, during the SpreadFEx campaign
M. J. Taylor1, P.-D. Pautet1, A. F. Medeiros2, R. Buriti2, J. Fechine2, D. C. Fritts3, S. L. Vadas3, H. Takahashi4, and F. T. São Sabbas4 1Utah State University, Logan, UT, USA
2Universidade Federal de Campina Grande, Campina Grande, Paraiba, Brazil
3NorthWest Research Associates, CoRA Division, Boulder, CO, USA
4Instituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, São Paulo, Brazil
Abstract. As part of the SpreadFEx campaign, coordinated optical and radio measurements were made from Brazil to investigate the occurrence and properties of equatorial Spread F, and to characterize the regional mesospheric gravity wave field. All-sky image measurements were made from two sites: Brasilia and Cariri located ~10° S of the magnetic equator and separated by ~1500 km. In particular, the observations from Brasilia provided key data in relatively close proximity to expected convective sources of the gravity waves. High-quality image measurements of the mesospheric OH emission and the thermospheric OI (630 nm) emission were made during two consecutive new moon periods (22 September to 9 November 2005) providing extensive data on the occurrence and properties of F-region depletions and regional measurements of the dominant gravity wave characteristics at each site.

A total of 120 wave displays were observed, comprising 94 short-period events and 26 medium-scale gravity waves. The characteristics of the small-scale waves agreed well with previous gravity wave studies from Brazil and other sites. However, significant differences in the wave propagation headings indicate dissimilar source regions for the Brasilia and Cariri datasets. The observed medium-scale gravity wave events constitute an important new dataset to study their mesospheric properties at equatorial latitudes. These data exhibited similar propagation headings to the short-period events, suggesting they originated from the same source regions. Medium-scale waves are generally less susceptible to wind filtering effects and modeling studies utilizing these data have successfully identified localized regions of strong convection, mainly to the west of Brasilia, as their most likely sources (Vadas et al., 2009).


Citation: Taylor, M. J., Pautet, P.-D., Medeiros, A. F., Buriti, R., Fechine, J., Fritts, D. C., Vadas, S. L., Takahashi, H., and São Sabbas, F. T.: Characteristics of mesospheric gravity waves near the magnetic equator, Brazil, during the SpreadFEx campaign, Ann. Geophys., 27, 461-472, https://doi.org/10.5194/angeo-27-461-2009, 2009.
Publications Copernicus
Download
Share