World Library  

QR link for Infrasound - the Cause of Strong Polar Mesosphere Winter Echoes? : Volume 24, Issue 2 (23/03/2006)
Add to Book Shelf
Flag as Inappropriate
Email this Book

Infrasound - the Cause of Strong Polar Mesosphere Winter Echoes? : Volume 24, Issue 2 (23/03/2006)

By Kirkwood, S.

Click here to view

Book Id: WPLBN0004001440
Format Type: PDF Article :
File Size: Pages 17
Reproduction Date: 2015

Title: Infrasound - the Cause of Strong Polar Mesosphere Winter Echoes? : Volume 24, Issue 2 (23/03/2006)  
Author: Kirkwood, S.
Volume: Vol. 24, Issue 2
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2006
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Belova, E., Rietveld, M., Chilson, P., Dalin, P., Singer, W., Häggström, I., & Kirkwood, S. (2006). Infrasound - the Cause of Strong Polar Mesosphere Winter Echoes? : Volume 24, Issue 2 (23/03/2006). Retrieved from http://community.worldlibrary.net/


Description
Description: Swedish Institute of Space Physics, Box 812, 98128 Kiruna, Sweden. The ESRAD 52-MHz and the EISCAT 224-MHz radars in northern Scandinavia observed thin layers of strongly enhanced radar echoes from the mesosphere (Polar Mesosphere Winter Echoes - PMWE) during a solar proton event in November 2004. Using the interferometric capabilities of ESRAD it was found that the scatterers responsible for PMWE show very high horizontal travel speeds, up to 500 ms-1 or more, and high aspect sensitivity, with echo arrival angles spread over as little as 0.3°. ESRAD also detected, on some occasions, discrete scattering regions moving across the field of view with periodicities of a few seconds. The very narrow, vertically directed beam of the more powerful EISCAT radar allowed measurements of the spectral widths of the radar echoes both inside the PMWE and from the background plasma above and below the PMWE. Spectral widths inside the PMWE were found to be indistinguishable from those from the background plasma. We propose that scatter from highly-damped ion-acoustic waves generated by partial reflection of infrasonic waves provides a reasonable explanation of the characteristics of the very strong PMWE reported here.

Summary
Infrasound - the cause of strong Polar Mesosphere Winter Echoes?

 

Click To View

Additional Books


  • Contribution of Proton and Electron Prec... (by )
  • Eiscat and Esrad Radars Observations of ... (by )
  • The Size of the Auroral Belt During Magn... (by )
  • Ion Dynamics During Compression of Mercu... (by )
  • A Classification of Spectral Populations... (by )
  • Winds and Tides in the Mid-latitude Sout... (by )
  • Quasi-periodic Elf/Vlf Wave Emissions in... (by )
  • Variations in Schumann Resonances and Th... (by )
  • Diurnal Internal Tides Detected in the A... (by )
  • Faith in a Seed: on the Origins of Equat... (by )
  • Solar Cycle Variations of ƑOF2 from Igy ... (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.