Abstract
Abstract. The plasma-wave experiment ASPI (analysis of spectra of plasma waves and instabilities) on board the INTERBALL spacecraft is a combined wave diagnostics experiment. It performs measurements of the DC and AC magnetic field vector by flux-gate and search-coil sensors, the DC and AC electric field vector by Langmuir double probes and the plasma current by Langmuir split probe. Preliminary data analysis shows the low noise levels of the sensors and the compatibility of new data with the results of previous missions. During several months of in-orbit operation a rich collection of data was acquired, examples of which at the magnetopause and plasma sheet are presented in second part of the paper.
Highlights
The INTERBALL project is orientated towards the investigation of the interaction between dierent parts of the magnetosphere in relation to changes in the solar
First INTERBALL-1 orbits passed through the solar wind, bow shock, magnetosheath and magnetopause regions
Several months later the orbit apogee shifted to the near-Earth magnetotail, so that INTERBALL-1 observed the tail lobes and the plasma sheet
Summary
The ASPI (analysis of spectra of plasma waves and instabilities) experiment is based on the method of combined wave diagnostics (CWD). Magnetic ®eld measurements Three-componentux-gate sensor ±Frequency range 0±25 Hz ±Sensitivity 0.005 nT (waveform) 0.2 nT (DC ®eld). The MIF-M instrument consists of theux-gate (BPP) and searchcoil (DM2) sensors, analogue electronics boards with lowpass and highpass ®lters, ®lter bank with seven analogue passband ®lters, A/D converter and DC/DC converter. OPERA is the electric ®eld instrument, including six spherical Langmuir probes with the preampli®ers, mounted on the booms and the electronic subsystem with analogue, digital electronics, A/D converter and DC/DC converter. Close collaboration with the subsatellite wave experiment is performed during periods of simultaneous measurements This provides a good opportunity for advanced data analysis. BuÈ chner) failed to switch on, likely due to hardware problems
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