The first in-situ observations of echoing HF radar backscatter targets

Details The first in-situ observations of echoing HF radar backscatter targets The first in-situ observations of echoing HF radar backscatter targets

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11a1688m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11A-1688

Computer Science

Sound

[2439] Ionosphere / Ionospheric Irregularities, [2471] Ionosphere / Plasma Waves And Instabilities, [2475] Ionosphere / Polar Cap Ionosphere, [2494] Ionosphere / Instruments And Techniques

Scientific paper

The first direct measurements of HF-backscatter echoing electron density structures were conduced by the ICI-2 sounding rocket launched into the cusp ionosphere over Svalbard 5 December 2008. The echoing targets for coherent HF radars are 10-m scale electron density structures, half the operating radar wave length. Descending from ~300-200 km altitude, ICI-2 traversed volumes of HF backscatter detected by the CUTLASS radar, near the poleward boundary of the active cusp. ICI-2 carried a novel 4-Needle Langmuir Probe system capable to measure absolute electron density at 5.7 kHz sampling rate which means sub-meter resolution along the trajectory. The payload was also equipped with a high resolution electron spectrometer to resolve fine scale structures in the cusp auroral precipitation, and it carried an electric field experiment to measure the plasma drift surrounding the space craft. The 10-m plasma irregularities were observed near the trailing edge of km scale gradients in the electron density, which is in favour of the gradient drift instability. The electron density gradients on which the gradient drift instability could operate were apparently modulated by the electron precipitation. Furthermore, plasma structuring also occurred near the centre of the inverted V electron beam, indicating that a current driven instability process is also to be considered.

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