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Decameter Mid-latitude Sporadic-e Irregularities in Relation with Gravity Waves : Volume 15, Issue 7 (30/11/-0001)

By Bourdillon, A.

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Book Id: WPLBN0003982249
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Decameter Mid-latitude Sporadic-e Irregularities in Relation with Gravity Waves : Volume 15, Issue 7 (30/11/-0001)  
Author: Bourdillon, A.
Volume: Vol. 15, Issue 7
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
-0001
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Lefur, E., Roux, Y. L., Haldoupis, C., Delloue, J., Bourdillon, A., & Ménard, J. (-0001). Decameter Mid-latitude Sporadic-e Irregularities in Relation with Gravity Waves : Volume 15, Issue 7 (30/11/-0001). Retrieved from http://www.netlibrary.net/


Description
Description: Laboratoire Structures Rayonnautes, UPRES-4 CNRS 6095, Université de Rennes 1, Rennes, France. HF radar observations of mid-latitude spo- radic-E irregularities carried out with the Valensole radar in South France are compared with simultaneous ionosonde measurements underneath the irregularity zones. In a previous study of Valensole radar data, it has been shown that HF backscatter from the night-time mid-latitude E region is usually associated with large- scale wave-like modulations. To obtain more informa- tion on the geophysical conditions prevailing during backscatter events, a new experiment was performed which also included a vertical ionosonde beneath the scattering region. The data to be presented here are from two periods when radar scattering appeared simulta- neously with large variations in the virtual height and the Doppler velocity of F-layer re¯ected echoes mea- sured with the vertical ionosonde, indicating very clearly the passage of atmospheric gravity waves (AGWs). The e.ect of the atmospheric waves on the sporadic-E layer is not always as marked as it is in the F region. In the ®rst event, the passage of the AGWs is accompanied by an upward followed by a downward movement of the Es-layer. The apparent descending movement of the Es-layer from 135 to 110 km in less than 10 min corresponded to a positive (downward) Doppler velocity of 35 m/s measured by the vertical ionosonde, and was accompanied by a range variation in the radar scattering region with a negative rate of about 90±110 m/s. In the second event, the Es-layer is not as strongly disturbed as in the previous one, but, nevertheless, the range varia- tions of the scattering region can still be associated with height ¯uctuations of the Es-layer.

Summary
Decameter mid-latitude sporadic-E irregularities in relation with gravity waves

 

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