vhf radar observations of turbulent structures in the polar mesopause region
Clicks: 139
ID: 196347
1997
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This
article has not been analysed, so there is no overall score —
reader engagement is measured and shown alongside.
Reader Engagement
Popular Article
30.0
/100
139 views
25 readers
AI Quality Assessment
Not analyzed
Readership in this journal
PopularRanked #178 of 484 articles by views in journal of food measurement and characterization
Most read
Least read
Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 484 in total.
Mint this article as an NFT
Not yet mintedCreate a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.
5
SUSD
one-off · no wallet required
Abstract
The mobile SOUSY VHF Radar was operated in
the summer of 1987 during the MAC/SINE campaign in northern Norway to study the
polar mesosphere summer echoes (PMSE). Measurements of the spectral width
indicate that two types of structures occur. In general mesospheric layers are
bifurcated exhibiting a narrow spectral width and a well-defined aspect
sensitivity. However, for about 10% of the observation time cells of enhanced
turbulence characterized by extremely broad spectral widths appear predominantly
in the upper sublayer above 86 km. Identification and separation of beam and
shear broadening allows a determination of the turbulence-induced component of
the spectral width. This case study reveals that during several events these
cloud-like structures of enhanced turbulence move with an apparent velocity of
several tens of meters per second which is almost identical with the phase trace
velocity of simultaneously observed waves. Since, at that time, the Richardson
number was less than a quarter, it was concluded that these turbulent cells were
generated by a Kelvin-Helmholtz mechanism. The horizontal extent of these
structures was calculated to be less than 40 km. A general relation between
spectral width and echo power was not detected. The turbulent component of the
spectral width was used to calculate typical values of the energy dissipation
rate at times where narrow spectral width dominates and during periods of
enhanced turbulence. In addition, the outer scale of the inertial subrange
(buoyancy scale) was estimated. For the first time the occurrence and motion of
this type of structures of enhanced spectral width is analyzed and discussed in
detail.
| Reference Key |
czechowsky1997annalesvhf
Use this key to autocite in the manuscript while using
SciMatic Manuscript Manager or Thesis Manager
|
|---|---|
| Authors | ;P. Czechowsky;R. Rüster |
| Journal | journal of food measurement and characterization |
| Year | 1997 |
| DOI |
10.1007/s00585-997-1028-8
|
| URL | |
| Keywords |
Citations
No citations found. To add a citation, contact the admin at info@scimatic.org
Comments
No comments yet. Be the first to comment on this article.