Coherent backscatter cross-section ratio measurements in the midlatitude E region ionosphere

Details Coherent backscatter cross-section ratio measurements in the midlatitude E region ionosphere Coherent backscatter cross-section ratio measurements in the midlatitude E region ionosphere

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.4351k&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A3, p. 4351-4360

Physics

3

Ionosphere: Midlatitude Ionosphere, Ionosphere: Plasma Waves And Instabilities, Ionosphere: Instruments And Techniques

Scientific paper

Dual-frequency coherent backscatter measurements from a fixed volume in the midlatitude E region ionosphere, made simultaneously with two radars operating at significantly different VHF radio frequencies, 144 MHz and 50 MHz, were used to study the scattering cross-section ratios and the spatial spectrum dependence in the 1-m to 3-m wavelength range. To calibrate the measurements, simultaneous aircraft echo intensities observed by the radars during the experiment were used. It was found that the 1-m to 3-m plasma wave scattering cross-section ratios, Σ=σ1m/σ3m, were always below unity, but their values depended strongly on the type of irregularities observed, either type 1 (large phase velocity Farley-Buneman) or type 2 (low phase velocity secondary) waves. Mean values for Σ were near ~0.4 for type 1 echoes and ~0.06 for type 2 echoes, suggesting that secondary waves are more difficult to generate at 1-m than at 3-m wavelength even though type 1 waves are nearly always seen simultaneously at both 50 and 144 MHz. Assuming a negative power law k dependence for the irregularity spatial spectrum, Ik~k-β, the spectrum slope β was found on the average to be about 1.0 and 2.8 for type 1 and type 2 irregularities, respectively, which suggests that the k spectrum is nearly 3 times steeper for type 2 than type 1 waves in the meter wavelength range. These figures are roughly consistent with the predictions of the unified theory of Sudan [1983] for both types of irregularities, but particularly for type 2 waves; for type 1 waves the agreement is not as good, but the theoretical predictions are not as well defined either.

Affiliated with

Also associated with

No associations

Rating

Coherent backscatter cross-section ratio measurements in the midlatitude E region ionosphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Coherent backscatter cross-section ratio measurements in the midlatitude E region ionosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coherent backscatter cross-section ratio measurements in the midlatitude E region ionosphere will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1451046