Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa31b09w&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA31B-09 INVITED
Physics
0300 Atmospheric Composition And Structure, 1600 Global Change (New Category), 3332 Mesospheric Dynamics, 3379 Turbulence, 6952 Radar Atmospheric Physics
Scientific paper
There are a sufficient number of VHF radars, capable of observing PMSE, distributed over a wide range of longitudes and latitudes as to provide an initial and rough empirical model of its characteristics. Of special interest are those in the same frequency range, in the vicinity of 50 MHz. Radars on this frequency have reported observations in a) The Harz and Kuehlungsborn, Germany; Kiruna, Sweeden; Andenes and Svaldbard, Norway, in the European sector; b) Poker Flat, Alaska; and Resolute Bay, Canada, in the North American sector; and c), Machu Picchu, King George Is. and Rothera in the Antarctic, plus some ship-borne observations along the southern Chilean Archipelago and the Drake Pass between South America and Antarctica. The large reported difference in reflectivity (more than 20 dB) and frequency of occurrence of PMSE between the northern and southern hemisphere at comparable latitudes is of special importance because of its implications on a possible difference in the minimum mesospheric temperature between both hemispheres. Furthermore, a very puzzling result is the relative power level of PMSE reported at Resolute Bay as compared with those at Poker Flat for the same season. Unfortunately, the variety of antennas, observing and processing techniques and definitions of terms (e.g., noise level) makes it difficult to compare results in an absolute way. It would have been desirable that the results had been presented in terms of the intrinsic radar reflectivity of the medium, a parameter which is independent of the observing system. It is recommended that effective radar reflectivities at 50 MHZ be derived from the existing data banks, after a careful calibration of antenna efficiency and other system parameters. Furthermore, to facilitate comparisons and be able to progress with an empirical model, an international observational campaign should be designed using a common observational and processing system, previously agreed upon.
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