World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

First Mesospheric Turbulence Study Using Coordinated Rocket and Mst Radar Measurements Over Indian Low Latitude Region : Volume 26, Issue 9 (12/09/2008)

By Chandra, H.

Click here to view

Book Id: WPLBN0004001864
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: First Mesospheric Turbulence Study Using Coordinated Rocket and Mst Radar Measurements Over Indian Low Latitude Region : Volume 26, Issue 9 (12/09/2008)  
Author: Chandra, H.
Volume: Vol. 26, Issue 9
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Das, U., Datta, J., S. Sinh, H. S., Chakravarty, S. C., Das, S. R., Chandra, H.,...Rao, N. V. (2008). First Mesospheric Turbulence Study Using Coordinated Rocket and Mst Radar Measurements Over Indian Low Latitude Region : Volume 26, Issue 9 (12/09/2008). Retrieved from http://members.worldlibrary.net/


Description
Description: Physical Research Laboratory, Ahmedabad, India. A campaign to study turbulence in the mesosphere, over low latitudes in India, using rocket-borne measurements and Indian MST radar, was conducted during July 2004. A rocket-borne Langmuir probe detected a spectrum of electron density irregularities, with scale sizes in the range of about 1 m to 1 km, in 67.5–78.0 km and 84–89 km altitude regions over a low latitude station Sriharikota (13.6° N, 80.2° E). A rocket-borne chaff experiment measured zonal and meridional winds about 30 min after the Langmuir probe flight. The MST radar located at Gadanki (13.5° N, 79.2° E), which is about 100 km west of Sriharikota, also detected the presence of a strong scattering layer in 73.5–77.5 km region from which radar echoes corresponding to 3 m irregularities were received. Based on the region of occurrence of irregularities, which was highly collisional, presence of significant shears in zonal and meridional components of wind measured by the chaff experiment, 10 min periodicity in zonal and meridional winds obtained by the MST radar and the nature of wave number spectra of the irregularities, it is suggested that the observed irregularities were produced through the neutral turbulence mechanism. The percentage amplitude of fluctuations across the entire scale size range showed that the strength of turbulence was stronger in the lower altitude regions and decreased with increasing altitude. It was also found that the amplitude of fluctuations was large in regions of steeper electron density gradients. MST radar observations showed that at smaller scales of turbulence such as 3 m, (a) the thickness of the turbulent layer was between 2 and 3 km and (b) and fine structures, with layer thicknesses of about a km or less were also embedded in these layers. Rocket also detected 3-m fluctuations, which were very strong (a few percent) in lower altitudes (67.5 to 71.0 km) and small but clearly well above the noise floor at higher altitudes. Rocket and radar results also point to the possibility of existence of thin layers of turbulence (<450 m). The turbulence parameters estimated from rocket-borne measurements of electron density fluctuations are consistent with those determined from MST radar observed Doppler spectra and the earlier works.

Summary
First mesospheric turbulence study using coordinated rocket and MST radar measurements over Indian low latitude region

Excerpt
Balsley, B. B. and Gage, K. S.: The MST Radar Technique: Potential for Middle Atmospheric Studies, Pageoph, 18, 453–493, 1980.; Blood, S. P., Mitchell. J. D., Croskey. C. L., Raymund, T. D., Thrane, E. V., Blix, T. A., Hopp, U. V., Fritts, D. C., and Schmidlin, F. J.: Studies of high latitude mesospheric turbulence by radar and rocket 2: measurements of small scale turbulence, J. Atmos. Terr. Phys., 50, 963–976, 1988.; Chakrabarty, D. K., Beig, G., Sidhu, J. S., and Das, S. R.: Fine scale structure and turbulence parameters in the equatorial middle atmosphere, J. Atmos. Terr. Phys., 51, 19–27, 1989.; Chakravarty, S. C., Datta Jayati, Kamala, S., and Gupta, S. P.: High-resolution mesospheric layer structures from MST radar backscatter echoes over low latitude, J. Atmos. Sol. Terr. Phys., 66, 859–866, 2004.; Chakravarty, S. C., Datta Jayati, and Revankar, C. P.: Climatology of long period oscillations in the equatorial middle atmosphere over Thumba, India, Curr. Sci., 63, 33–42, 1992.; Datta Jayati, Chakravarty, S. C., and Prasad, B. S. N.: Indian MST radar-mesospheric studies, Curr. Sci., 81, 661–666, 2001.; Fritts, D. C.: Gravity wave saturation in the middle atmosphere: a review of theory and observations, Rev. Geophys. Space Phys., 22, 275–308, 1984.; Fritts, D. C., Bizon, C., Werne, J. A., and Meyer, C. K.: Layering accompanying turbulence generation due to shear instability and gravity-wave breaking, J. Geophys. Res., 108, 8452, doi:10.1029/2002JD002406, 2003.; Gage, K. S. and Balsley, B. B.: On the scattering and reflection mechanisms contributing to clear air radar echoes from the troposphere, stratosphere and mesosphere, Radio Sci., 15, 243–257, 1980.; Gallet, R. M.: Aerodynamical mechanism producing electron density fluctuations in turbulent ionized layers, Proc. IRE, 43B, 1240–1252, 1955.; Goldberg, R. A., Fritts, D. C., Chou, H. G., Barcus, J. R., and Schmidlin, F. J.: Studies of high latitude mesospheric turbulence by radar and rocket 1. energy deposition and wave structure, J. Atmos. Terr. Phys., 50, 951–961, 1988.; Goldberg, R. A., Lehmacher, G. A., Schmidlin, F. J., Fritts, D. C., Mitchell, J. D., Croskey, C. L., Friedrich, M., and Swartz, W. E.: Equatorial dynamics observed by rocket, radar and satellite during the CADRE/MALTED campaign:1. Programmatics and small-scale fluctuations, J. Geophys. Res., 102, 26 179–26 190, 1997.; Heisenberg, W.: Zur stastischen Theorie der Turbulenz, Z. Phys., 124, 628–657, 1948.; Hocking, W. K.: On the extension of atmospheric turbulence parameters from radar backscatter Doppler spectra, 1, Theory, J. Atmos. Terr. Phys., 45, 89–102, 1982.; Kamala, S., Narayana Rao, D., Chakravarty, S. C., Datta Jayati, and Prasad, B. S. N.: Vertical structure of mesospheric echoes from the Indian MST radar, J. Amos. Sol. Terr. Phys., 65, 71–83, 2003.; Kumar, G. K., Ratnam, M. V., Patra, A. K., Rao, V. V. M. J., Rao, S. V. B., and Rao, D. N.: Climatology of the low-latitude mesospheric echo characteristics observed by Indian MST Radar, J. Geophys. Res., 112, D06109, doi:10.1029/2006JD007609, 2007.; Kubo, K., Sugiyama, T., Nakamura, T., and Fukao, S.: Seasonal and interannual variability of mesospheric echoes observed with the Middle and Upper Atmosphere radar during 1986–1995, Geophys. Res. Lett., 24, 1211–1214, 1997.; Lehmacher, G. A., Croskey, C. L., Mitchell, J. D., Friedrich, M., Lubken, F.-J., Rapp, M., Kudeki, E., and Fritts, D. C.: Intense turbulence observed above a mesospheric temperature inversion at equatorial latitude, Geophys. Res. Lett., 33, L08808, doi:10.1029/2005GL024345, 2006.; Lubken, F.-J., Hillert, W., Lehmacher, G., and von Zahn, U.: Experiments revealing small impact of turbulence on energy budget of the mesosphere and lower thermosphere, J. Geophys. Res., 98, 20 369–20 384, 1993.; Lubken, F.-J.: Seasonal variation of turbulent energy dissipation rates at high latitudes as determined by in situ measurements of neutral density fluctuations, J. Geophys. Res., 102, 13 441–13 45

 

Click To View

Additional Books


  • Near Real Time Sla and Sst Products Duri... (by )
  • Vlasov Simulations of Parallel Potential... (by )
  • Tec Variations During Low Solar Activity... (by )
  • Climatic Variability of the Mean Flow an... (by )
  • Software Radar Signal Processing : Volum... (by )
  • Inertia-gravity Waves in the Troposphere... (by )
  • Chorus Source Region Localization in the... (by )
  • Determination of Humidity and Temperatur... (by )
  • Comparisons Between Euv/Image Observatio... (by )
  • Comparison of Temporal Fluctuations in t... (by )
  • Observation of Shocks Associated with Cm... (by )
  • Ionospheric Long-term Trends: Can the Ge... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World 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.