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The Quasi-two-day Wave Studied Using the Northern Hemisphere Superdarn Hf Radars : Volume 25, Issue 8 (29/08/2007)

By Malinga, S. B.

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Book Id: WPLBN0004001548
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: The Quasi-two-day Wave Studied Using the Northern Hemisphere Superdarn Hf Radars : Volume 25, Issue 8 (29/08/2007)  
Author: Malinga, S. B.
Volume: Vol. 25, Issue 8
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Malinga, S. B., & Ruohoniemi, J. M. (2007). The Quasi-two-day Wave Studied Using the Northern Hemisphere Superdarn Hf Radars : Volume 25, Issue 8 (29/08/2007). Retrieved from

Description: School of Physics, University of KwaZulu-Natal, Durban 4000, South Africa. Data from the Super Dual Radar Network (SuperDARN) radars for 2002 were used to study the behaviour of the quasi-two-day wave (QTDW) in the Northern Hemisphere auroral zone. The period of the QTDW is observed to vary in the range of ~42–56 h, with the most dominant period being ~48 h and secondary peaks at ~42- and ~52-h. The spectral power shows a seasonal variation with a peak power (max~70) in summer. The power shows variations of several days and there is also evidence of changes in wave strength with longitude. The 42-h and the 48-h components tend to be strongly correlated in summer. The onset of enhanced wave activity tends to coincide with the westward acceleration of the zonal mean flow and occurs at a time of strong southward meridional flow. The most frequent instantaneous hourly period is in the 40 to 50 h period band, in line with the simultaneous dominance of the 42-h and the 48-h components. The wave numbers are less variable and are around −2 to −4 during times of strong wave activity. For a period of ~48 h, the zonal wave number is about −3 to −4, using a negative value to indicate westward propagating waves. The 42-h and the 52-h components cover a wider band in the −4 to 1 range. The wide zonal wave number spectrum in our results may account for the observed longitudinal variation in the spectral power of the wave.

The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars

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