Cedar Instruments

From CedarWiki
Jump to: navigation, search
Return to the instrument list

820 - HHF - Halley Antarctica HF Radar
Instrument Type: Instrument > Radar > CoherentIonosphericRadar > HFRadar
Observatory: None
Observation Site: HHF - Halley Antarctica HF Radar
Operating Mode:

Instrument Page: HHF

The Halley HF radar is located in Antarctica (76 degs S, 26 deg W) and overlooks a section of ionosphere poleward of 78 deg that covers much of eastern Antarctica and includes South Pole station. The field -of-view is conjugate to the west coast of Greenland and the Goose Bay HF radar. It has operated since 1988. The facility is part of the SuperDARN network of HF radars that extends from western North America to Scandinavia in the Northern hemisphere and covers much of Antarctica in the Southern hemisphere. The SuperDARN radar for the most direct 2-D merging of Halley velocity data is located at Syowa, Antarctica. The radar forms and steers its beam by the phasing of transmissions from 16 elements in a linear antenna array. A second 4-element array provide the capability to measure elevation angle. The basic radar operation consists of the following steps: i) selection of a beam position (0-15) ii) search for the quietest 5-kHz channel about the assigned transmitting frequency (8-20 MHz) iii) repeated transmission of a multi-pulse sequence over the selected integration period and reception of backscattered signal with gating in range (1-70) iv) calculation of the auto-correlation functions (ACFs). These operations are usually carried out in sequence for the 16 beam positions, which collectively constitute 1 scan. The beam integration period is typically 6 or 7 sec, and the scan repeat time is 96 sec or 120 sec. Within a scan, beam 0 corresponds to the most westward beam position and beam 15 to the most eastward. The azimuth sector scanned is approximately 50 deg wide and is centered on 165 deg E of N.