the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
High-time resolution analysis of meridional tides in the upper mesosphere and lower thermosphere at mid-latitudes measured by the Falkland Islands SuperDARN radar
Andrew J. Kavanagh
Neil Cobbett
Paul Breen
Tim Barnes
Abstract. Solar tides play a major role in the dynamics of the upper mesosphere and lower thermosphere (MLT). Hence, a comprehensive understanding of these tides is important for successful modelling of the MLT region. Most ground-based observations of tidal variations in the MLT have been from meteor radar measurements with a temporal resolution of 1 hr. Here, we take a different perspective on these tidal variations using high-resolution 1-min neutral wind measurements from the Falkland Islands SuperDARN radar. This analysis shows that these higher-resolution data can be used to identify higher frequency tidal components than are typically observed by meteor radars (up to a heptadiurnal component). It also shows evidence of significant power in these higher frequency components, particularly in the quaddiurnal component, which may be particularly suitable for a global analysis using high-resolution SuperDARN neutral wind measurements. The high-resolution analysis also shows evidence of fluctuations with a frequency of 1.5 cycles/day, as well as higher frequency fluctuations, accompanying a quasi-two-day wave. We discuss the limitations of this high-resolution analysis method, and the new opportunities that it may provide. We conclude that higher-resolution SuperDARN neutral wind measurements need to be better exploited in the future, as they provide a complementary way of studying tides and waves in the MLT.
Gareth Chisham et al.
Status: open (until 05 Jul 2023)
Gareth Chisham et al.
Gareth Chisham et al.
Viewed
HTML | XML | Total | BibTeX | EndNote | |
---|---|---|---|---|---|
81 | 29 | 6 | 116 | 4 | 3 |
- HTML: 81
- PDF: 29
- XML: 6
- Total: 116
- BibTeX: 4
- EndNote: 3
Viewed (geographical distribution)
Country | # | Views | % |
---|
Total: | 0 |
HTML: | 0 |
PDF: | 0 |
XML: | 0 |
- 1