Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51b0836i&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM51B-0836
Physics
0609 Antennas, 0689 Wave Propagation (4275), 6964 Radio Wave Propagation, 6994 Instruments And Techniques, 7894 Instruments And Techniques
Scientific paper
Two components of ac electric field are measured by two pairs of long dipole antennas onboard GEOTAIL spacecraft; the wire antenna (WANT) and the probe antenna (PANT). The frequency range is from dc to 800 kHz. To obtain accurate values of electric field components, we should evaluate an exact antenna effective length and an accurate antenna impedance of each dipole. The antenna impedance has been measured in situ, and the effective lengths have been so far assumed simply as 50 m, half of their tip-to-tip length of 100 m. However it is not easy to estimate actual effective length especially in the low frequency such as several hundreds Hz or lower. In this study, we conduct an experiment of rheometry. A 1/100 scale model of GEOTAIL and its wire antennas are immersed in a water tank with an applied uniform ac electric field. By actually receiving the ac field with the wire antenna attached to the GEOTAIL model, we evaluate various characteristics of the antenna, such as effective lengths, directivity patterns, and frequency responses. We will report the results of the experiment, and discuss the characteristics of the dipole antennas onboard GEOTAIL.
Higashi Ryoichi
Imachi T.
Matsumoto Haru
Nagano Isamu
Tsutsui Minoru
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