World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Gravity Wave Penetration Into the Thermosphere: Sensitivity to Solar Cycle Variations and Mean Winds : Volume 26, Issue 12 (02/12/2008)

By Fritts, D. C.

Click here to view

Book Id: WPLBN0004001967
Format Type: PDF Article :
File Size: Pages 21
Reproduction Date: 2015

Title: Gravity Wave Penetration Into the Thermosphere: Sensitivity to Solar Cycle Variations and Mean Winds : Volume 26, Issue 12 (02/12/2008)  
Author: Fritts, D. C.
Volume: Vol. 26, Issue 12
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Vadas, S. L., & Fritts, D. C. (2008). Gravity Wave Penetration Into the Thermosphere: Sensitivity to Solar Cycle Variations and Mean Winds : Volume 26, Issue 12 (02/12/2008). Retrieved from http://ebook.worldlibrary.net/


Description
Description: NorthWest Research Associates, CoRA Division, 3380 Mitchell Lane, Boulder, CO 80301, USA. We previously considered various aspects of gravity wave penetration and effects at mesospheric and thermospheric altitudes, including propagation, viscous effects on wave structure, characteristics, and damping, local body forcing, responses to solar cycle temperature variations, and filtering by mean winds. Several of these efforts focused on gravity waves arising from deep convection or in situ body forcing accompanying wave dissipation. Here we generalize these results to a broad range of gravity wave phase speeds, spatial scales, and intrinsic frequencies in order to address all of the major gravity wave sources in the lower atmosphere potentially impacting the thermosphere. We show how penetration altitudes depend on gravity wave phase speed, horizontal and vertical wavelengths, and observed frequencies for a range of thermospheric temperatures spanning realistic solar conditions and winds spanning reasonable mean and tidal amplitudes. Our results emphasize that independent of gravity wave source, thermospheric temperature, and filtering conditions, those gravity waves that penetrate to the highest altitudes have increasing vertical wavelengths and decreasing intrinsic frequencies with increasing altitude. The spatial scales at the highest altitudes at which gravity wave perturbations are observed are inevitably horizontal wavelengths of ~150 to 1000 km and vertical wavelengths of ~150 to 500 km or more, with the larger horizontal scales only becoming important for the stronger Doppler-shifting conditions. Observed and intrinsic periods are typically ~10 to 60 min and ~10 to 30 min, respectively, with the intrinsic periods shorter at the highest altitudes because of preferential penetration of GWs that are up-shifted in frequency by thermospheric winds.

Summary
Gravity wave penetration into the thermosphere: sensitivity to solar cycle variations and mean winds

Excerpt
Bishop, R., Aponte, N., Earle, G. D., Sulzer, M., Larsen, M. F., and Peng, G.: Arecibo observations of ionospheric perturbations associated with the passage of tropical storm Odette, J. Geophys. Res., 111, A11320, doi:10.1029/2006JA011668, 2006.; Abdu, M., Kherani, E., Batista, I., et al.: Gravity wave influences on plasma instability growth rates based on observations during the Spread F Experiment (SpreadFEx), Ann. Geophys., in review, 2008. %angeo-2008-0028; Alexander, M. J., Holton, J. R., and Durran, D. R.: The gravity wave response above deep convection in a squall line simulation, J. Atmos. Sci., 52, 2212–2226, 1995.; Anderson, D. N., Richmond, A. D., Balsley, B. B., Roble, R. G., Biondi, M. A., and Sipler, D. P.: In situ generation of gravity waves as a possible seeding mechanism for equatorial spread-F, Geophys. Res. Lett., 9, 789–792, 1982.; Bauer, S. J.: An apparent ionospheric response to the passage of hurricanes, J. Geophys. Res., 63, 265–269, 1958.; Crowley, G., Jones, T. B., and Dudeney, J. R.: Comparison of short period TID morphologies in Antarctica during geomagnetically quiet and active intervals, J. Atmos. Terres. Phys., 49, 1155–1162, 1987.; Dewan, E. M., Picard, R. H., O'Neil, R. R., Gardiner, H. A., Gibson, J., Mill, J. D., Richards, E., Kendra, M., and Gallery, W. O.: MSX satellite observations of thunderstorm-generated gravity waves in mid-wave infrared images of the upper stratosphere, Geophys. Res. Lett., 25, 939–942, 1998.; Djuth, F. T., Sulzer, M. P., Elder, J. H., and Wickwar, V. B.: High-resolution studies of atmosphere-ionosphere coupling at Arecibo Observatory, Puerto Rico, Radio Sci., 32, 2321–2344, 1997.; Djuth, F. T., Sulzer, M. P., Gonzales, S. A., Mathews, J. D., Elder, J. H., and Walterscheid, R. L.: A continuum of gravity waves in the Arecibo thermosphere?, Geophys. Res. Lett., 31, L16801, doi:10.1029/2003GL019376, 2004.; Francis, S. H.: Acoustic-gravity modes and large-scale traveling ionospheric disturbances of a realistic, dissipative atmosphere, J. Geophys. Res., 78, 2278–2301, 1973.; Fritts, D. C., Abdu, M. A., Batista, B. R., et al.: Overview and Summary of the Spread F Experiment (SpreadFEx), Ann. Geophys., in press, 2008a. % angeo-2008-0029; Fritts, D. C., Abdu, M. A., Batista, B. R., et al.: The Spread F Experiment (SpreadFEx): Program overview and first results, Earth, Planets and Space, CPEA special issue, in press, 2008b.; Fritts, D. C., Vadas, S. L., Riggin, D. M., et al.: Gravity wave influences on equatorial spread F based on observations during the Spread F Experiment (SpreadFEx), Ann. Geophys., 26, 3235–3252, 2008c.; Fritts, D. C. and Alexander, M. J.: Gravity dynamics and effects in the middle atmosphere, Rev. Geophys., 41(1), 1003, doi:10.1029/2001RG000106, 2003.; Fritts, D. C., Vadas, S. L., Wan, K., and Werne, J. A.: Mean and variable forcing of the middle atmosphere by gravity waves, J. Atmos. Solar-Terr. Phys., 68, 247–265, 2006.; Vadas, S. L., Fritts, D. C., and Alexander, M. J.: Mechanism for the generation of secondary waves in wave breaking regions, J. Atmos. Sci., 60, 194–214, 2003.; Fritts, D. C., Vadas, S. A., and Yamada, Y.: An estimate of strong local gravity wave body forcing based on OH airglow and meteor radar observations, Geophys. Res. Lett., 29(10), 1429, doi:10.1029/2001GL013753, 2002.; Georges, T. M.: HF Doppler studies of traveling ionospheric disturbances, J. Atmos. Terr. Phys., 30, 735–746, 1968.; Hearn, A. L. and Yeh, K. C.: Medium scale TIDs and their associated internal gravity waves as seen through height-dependent electron density power spectra, J. Geophys. Res., 82, 4983–4990, 1977.; Hickey, M. P. and Cole, K. D.: A quartic dispersion relation for internal gravity waves in the thermosphere, J. Atmos. Terres. Phys., 49, 889–899, 1987.; Hickey, M. P. and Cole, K. D.: A numerical model for gravity wave dissipation in the thermosphere, J. Atmos. Terres. Phys., 50, 689–697, 1988.; Hines, C. O.: Internal atmospheric gravity waves at ionospher

 

Click To View

Additional Books


  • Ionospheric Energy Input as a Function o... (by )
  • Temperature Retrieval with Vhf Radar Usi... (by )
  • Magnetic Reconnection Processes Induced ... (by )
  • Identification of the Imf Sector Structu... (by )
  • Thin Current Sheets with Strong Bell-sha... (by )
  • Periodic Modulation of Gas Giant Magneto... (by )
  • On the Motion of Dayside Auroras Caused ... (by )
  • Observations of Significant Flux Closure... (by )
  • Comparison of Temporal Fluctuations in t... (by )
  • Comparisons of Refractive Index Gradient... (by )
  • Common Volume Coherent and Incoherent Sc... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.