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Astron. Astrophys. 354, 1101-1109 (2000)

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2. Nançay survey receiver and Wind/WAVES experiment

Simultaneous observations of Jupiter radio emission are performed using WAVES experiment data aboard the WIND spacecraft and the Nançay observations. The two receivers cover a total frequency band of about 39 MHz (from 1 MHz to 40 MHz) with a common part between 10 MHz and 13.8 MHz. In the following more details on those receivers and the associated antennas are given.

2.1. Nançay Decameter Array (NDA)

The antenna array consists of two subarrays, one sensitive to the RHC radiation, the other one to the LHC (Boischot et al. 1980). Each subarray consists of 72 conical helix antennas (Erickson & Fischer 1974) with a gain of about 25 dB. The Nançay survey receiver is a spectro-analyser receiver with an instantaneous bandwidth of 300 kHz and a sweeping time of 0.5 second. The sensitivity near 30 MHz is [FORMULA]S[FORMULA] W.m-2.Hz-1 (Dulk et al. 1994). The array can track Jupiter during 8 hours around the meridian transit in the frequency band from 10 to 40 MHz. A 20 MHz high pass filter can be added to limit human interference during the day time. Three other receivers can be connected to the antenna area. A polarimeter with 30 kHz bandwidth, which combines the output of the left and right arrays, allows to compute the complete state of polarization of the wave. The two other receivers have a high time resolution (few milliseconds): an acousto-optic receiver (Lecacheux et al. 1993) and a digital spectropolarimeter receiver (Kleewein et al. 1997) which are mainly used for millisecond radio burst observations.

2.2. The WAVES experiment on the Wind spacecraft

The Wind spacecraft is part of the International Solar Terrestrial Physics (ISTP) program. This satellite studies the dynamics of the interplanetary medium, the Earth's bow shock and terrestrial magnetosphere. The WAVES experiment is a plasma wave and radio instrument covering the frequency range from near DC to 14 MHz (Bougeret et al. 1995). Our analysis concerns the data recorded by RAD2 which is connected to two orthogonal electric dipoles, one of 100 m, the other one of 15 m tip to tip. The RAD2 receiver covers the frequency range from 1.075 to 13.825 MHz with a band pass of 20 kHz. The acquisition time is 20 ms with a standard cycle obtained every 16 seconds. The frequency band has been scanned over 16 channels in some periods of 1995. Since the end of that year a 256 channel mode was definitely adopted.

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© European Southern Observatory (ESO) 2000

Online publication: February 25, 2000