Computer Science – Sound
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa11a1457d&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA11A-1457
Computer Science
Sound
[2415] Ionosphere / Equatorial Ionosphere, [2439] Ionosphere / Ionospheric Irregularities, [2494] Ionosphere / Instruments And Techniques
Scientific paper
The Conjugate Point Equatorial Experiment (COPEX) campaign was held from October 1st to December 10th, 2002, over 4 sites in the Brazilian territory: Campo Grande (20.5o S, 54.7o W, -22.3o dip angle), Alta Floresta (9.7oS, 56.0o W, -3.38o dip angle), Cachimbo (9.5oS, 54.8oW, -4.25o dip angle) and Boa Vista (2.8o N, 60.7o W, -22.0o dip angle). Many ionospheric sounding instruments including GPS receivers, VHF receivers, all-sky imagers, digital ionosondes, and VHF radar were installed at the COPEX stations. In this work we will focus on the GPS (1.575 GHz) and VHF (240 MHz) receivers’ data. These receivers were set up to detect the equatorial scintillations and to measure ionospheric scintillation pattern velocities. Then, the zonal irregularity drift velocities were estimated by applying a methodology that corrects the effects due to vertical drifts and the geometrical factors. The amplitude scintillations and the zonal velocities measured by these two methods are compared. The results reveal the coexistence of kilometer (VHF) and hundred-meter scale (L-band) irregularities into the underlying depletion structure. However, the VHF scintillations are more intense and tend to cease latter than the GPS L-band scintillations. Over the conjugate site of Campo Grande the average zonal velocity at VHF was consistently larger than the estimated GPS velocities, whereas over Boa Vista they are comparable. The hundred meter scale structures causing L-band scintillations seem to be drifting with comparable velocities over both the conjugate points, whereas the kilometer scale structures appear to be drifting over Campo Grande with larger velocities until about local midnight. Complementary data of ionospheric parameters scaled from collocated digital ionosondes and results published in previous COPEX reports are used in the analysis.
Abdu Mangalathayil Ali
Batista Inez S.
Beach Theodore L.
de Paula Eurico R.
Groves Keith M.
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