First mesospheric observations using an imaging Doppler interferometer adaptation of the dynasonde at Halley, Antarctica
The digital ionospheric sounder, or dynasonde, located at the British Antarctic Survey’s research station at Halley, Antarctica, has recently been operated as an imaging Doppler interferometer (IDI). The implementation of this mode of operation does not require any changes to the system hardware but involves a specially written sounding configuration and newly designed data analysis software. Using four independent antennas and two receivers, the signals returned from mesospheric altitudes are range-gated and processed using Doppler sorting and spatial interferometry. A three-dimensional (3-D) image of the scattering locations can then be built up for a region stretching to over 30 degrees from the zenith. The sky map locations and Doppler velocities of the individual scattering points are used to fit a 3-D velocity vector representing the motion of the neutral wind in the mesosphere. In this paper the radar hardware, sounding configuration, and data processing are described, and the relative merits of the IDI technique as applied at Halley are discussed. The characteristics of the scattering points are outlined, and initial neutral wind measurements are presented.
Chargesfor violation of Republic Act 9165, or the Comprehensive Dangerous Drugs Act of2002 will be filed against them. (WithPDEA-6/PN) Six persons including a suspected drug den maintainer were arrested in an entrapment operation in Barangay 5, San Carlos City, Negros Occidental on Sept. 28. PDEA REGION VI-WESTERN VISAYAS The suspects were now under thecustody of the PDEA-Negros Occidental. The operatives were able to seizesuspected shabu valued at around P136,000. BACOLOD City – A suspected operator ofa drug den and five individuals were arrested in a sting operation in Barangay5, San Carlos City, Negros Occidental. Joint operation of the Philippine DrugEnforcement Agency (PDEA)-Negros Occidental and PDEA-Guimaras led to the arrestof Jon Antonio (drug den maintainer), Jessie Santa Ana, Jimelo Gaspe, RamilMahinay, Efren Ejara, and a minor around 5:15 p.m. on Sept. 28.