English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this paper an experiment designed for\udmultifrequency azimuthal Doppler-spectrum investigations of decametre-scale\udplasma irregularities in the mid-latitude <i>E</i> region is introduced and some\udpreliminary results are presented. The observations were made with the\udhigh-frequency Valensole radar in the south of France. The radar operated in a\udmultifrequency mode that allowed simultaneous measurements of Doppler spectra at\udthe four frequencies of 9.23, 11.03, 12.71 and 16.09 MHz, which correspond to\udscatter from field-aligned irregularities with wavelengths of 16.2, 13.6, 11.8\udand 9.3 m, respectively. In addition, a digital ionosonde was operating beneath\uda small part of the radar viewing region. The data show that lower-frequency\udechoes are stronger, more frequent and more spatially extended than\udhigher-frequency ones, in general agreement with theory and rocket measurements.\udOn the other hand, the preliminary analysis shows no pronounced differences of\udthe Doppler spectrum with radar frequency. Some trends in the spectral moments\uddo exist, however, which can be understood as the result of temporal and/or\udspatial mixing of backscatter from directly generated (primary) plasma waves by\udthe gradient drift instability and secondary low-velocity waves. Finally, a\udclose relation of mid-latitude coherent backscatter with patchy sporadic <i>E</i>-layers\udis present in the data, but the details of this relation remain unresolved

&lt;i&gt;E&lt;/i&gt;-region mid-latitude decametre irregularities observed at four radar frequencies. Experiment and first results

<i>E</i>-region mid-latitude decametre irregularities observed at four radar frequencies. Experiment and first results