Patches of polar mesospheric summer echoes characterized from radar imaging observations with MAARSY
Item
Title (Dublin Core)
Patches of polar mesospheric summer echoes characterized from radar imaging observations with MAARSY
Description (Dublin Core)
A recent study has hypothesized that polar mesospheric summer echoes (PMSEs)
might consist mainly of localized isotropic scattering. These results have
been inferred from indirect measurements. Using radar imaging with the Middle
Atmosphere Alomar Radar System (MAARSY), we observed horizontal structures
that support our previous findings. We observe that small-scale
irregularities, causing isotropic scattering, are organized in patches. We
find that patches of PMSEs, as observed by the radar, are usually smaller
than 1 km. These patches occur throughout the illuminated volume, supporting
that PMSEs are caused by localized isotropic or inhomogeneous scattering.
Furthermore, we show that imaging can be used to identify side lobe
detections, which have a significant influence even for narrow beam
observations. Improved spectra estimations are obtained by selecting the
desired volume to study parameters such as spectral width and to estimate the
derived energy dissipation rates. In addition, a combined wide beam
experiment and radar imaging is used to resolve the radial velocity and
spectral width at different volumes within the illuminated
volume.
might consist mainly of localized isotropic scattering. These results have
been inferred from indirect measurements. Using radar imaging with the Middle
Atmosphere Alomar Radar System (MAARSY), we observed horizontal structures
that support our previous findings. We observe that small-scale
irregularities, causing isotropic scattering, are organized in patches. We
find that patches of PMSEs, as observed by the radar, are usually smaller
than 1 km. These patches occur throughout the illuminated volume, supporting
that PMSEs are caused by localized isotropic or inhomogeneous scattering.
Furthermore, we show that imaging can be used to identify side lobe
detections, which have a significant influence even for narrow beam
observations. Improved spectra estimations are obtained by selecting the
desired volume to study parameters such as spectral width and to estimate the
derived energy dissipation rates. In addition, a combined wide beam
experiment and radar imaging is used to resolve the radial velocity and
spectral width at different volumes within the illuminated
volume.
Creator (Dublin Core)
S. Sommer
J. L. Chau
Subject (Dublin Core)
Science
Q
Physics
QC1-999
Geophysics. Cosmic physics
QC801-809
Publisher (Dublin Core)
Copernicus Publications
Date (Dublin Core)
2016-12-01T00:00:00Z
Type (Dublin Core)
article
Identifier (Dublin Core)
10.5194/angeo-34-1231-2016
0992-7689
1432-0576
https://doaj.org/article/2e19fc814fed4355a015325a2bb8d690
Source (Dublin Core)
Annales Geophysicae, Vol 34, Pp 1231-1241 (2016)
Language (Dublin Core)
EN
Relation (Dublin Core)
https://www.ann-geophys.net/34/1231/2016/angeo-34-1231-2016.pdf
https://doaj.org/toc/0992-7689
https://doaj.org/toc/1432-0576
Provenance (Dublin Core)
Journal Licence: CC BY