Extraction of PMSE from SuperDARN data

Details Extraction of PMSE from SuperDARN data Extraction of PMSE from SuperDARN data

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa13a0235h&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA13A-0235

Other

0305 Aerosols And Particles (0345, 4801, 4906), 0340 Middle Atmosphere: Composition And Chemistry, 0520 Data Analysis: Algorithms And Implementation, 0910 Data Processing, 3332 Mesospheric Dynamics

Scientific paper

Polar mesosphere summer echoes (PMSE) are strong radar backscatters from the polar summer mesosphere, which has been studied using VHF radars in the Arctic regions for more than 20 years. Recent investigations of near-range measurements recorded by the Super Dual Auroral Radar Network have suggested that PMSE can be detected by the coherent HF radars of SuperDARN (Ogawa et al., 2002, 2003, 2004; Hosokawa et al., 2004). Currently, 16 SuperDARN radars are operating in both hemispheres. Thus, if near-range SuperDARN measurements contain large numbers of PMSE, SuperDARN data could be a powerful tool for monitoring PMSE activity over vast areas of the polar regions in both hemispheres. In reality, however, it is not easy to identify individual PMSE in near-range measurements of the SuperDARN due to contamination by other backscatter targets such as auroral E region echoes and meteors. Hence, the actual occurrence distribution of PMSE in SuperDARN data remains unclear. The present paper has addressed this issue by developing an algorithm for automated extraction of PMSE from near-range SuperDARN measurements. The algorithm is applied to observations obtained by the Syowa East and Iceland East radars whose fields-of-view are magnetically conjugate. The rate of PMSE occurrence in the SuperDARN data is greatly enhanced in summer months, reaching a maximum of 90% in Iceland and 60% in Syowa near the summer solstice. The diurnal variation of PMSE occurrence reaches a maximum near the noon meridian, with a distinct minimum at 20LT. These features are consistent with those derived from previous VHF radar observations, suggesting that the SuperDARN data contain large numbers of PMSE events. The interhemispheric asymmetry of PMSE occurrence is also estimated, and it is shown that the PMSE activity is 1.5 times higher in the Northern Hemisphere than in the Southern Hemisphere. The algorithm was also applied to all of the SuperDARN radar in both hemispheres. Then, longitudinal distribution and interhemispheric asymmetry of PMSE activity have been estimated in a statistical fashion.

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