Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.490 IF 1.490
  • IF 5-year value: 1.445 IF 5-year
    1.445
  • CiteScore value: 2.9 CiteScore
    2.9
  • SNIP value: 0.789 SNIP 0.789
  • IPP value: 1.48 IPP 1.48
  • SJR value: 0.74 SJR 0.74
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 88 Scimago H
    index 88
  • h5-index value: 21 h5-index 21
Volume 24, issue 7
Ann. Geophys., 24, 1861–1869, 2006
https://doi.org/10.5194/angeo-24-1861-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 1861–1869, 2006
https://doi.org/10.5194/angeo-24-1861-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  09 Aug 2006

09 Aug 2006

Gadanki radar observations of daytime E region echoes and structures extending down to 87 km

A. K. Patra1, S. Sripathi2, P. B. Rao3, and R. K. Choudhary4 A. K. Patra et al.
  • 1National Atmospheric Research Laboratory, Tirupati, India
  • 2Indian Institute of Geomagnetism, New Panvel, Navi Mumbai, India
  • 3National Remote Sensing Agency, Balanagar, Hyderabad, India
  • 4Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada

Abstract. Observations of daytime E region echoes extending to altitudes as low as 87 km made using the Gadanki MST radar are presented. The echoing regions display descending layer resembling the characteristics of tidal winds and show structures with periods 2–4 min having both positive and negative slopes. At the center of the layer where strongest SNR is observed, the velocity is maximum and spectral width is minimum. At altitudes slightly above and below, where SNR is relatively low, velocity is low but spectral width is maximum. Daytime observations of echoes extending to such a low altitude and associated structures akin to nighttime quasi-periodic echoes throughout the observational period are the most significant results, not reported earlier from Gadanki and other locations. Other notable results are large SNR (as high as 15 dB) and spectral width (as high as 70 m/s) at the bottommost altitudes, where collisional damping of the plasma waves is significant

Publications Copernicus
Download
Citation