The SS-520-2 rocket experiment was carried out over Ny-alesund, Svalbard, Norway, in the dayside polar region. The onboard Plasma Wave Analyzer (PWA) succeeded in observing waveform data in the 10 Hz to 15 kHz frequency range and high frequency spectrum data up to 3 MHz. These data showed impulsive packet-like waveforms with frequencies around 3 kHz to 4 kHz as well as auroral hiss emissions. The packet-like waveforms appeared for the duration of 100--500 ms, and the frequencies of their spectral peaks were well below the lower cutoff frequency of the auroral hiss emissions. Their polarizations, which were identified on the rocket spin plane perpendicular to the ambient magnetic field, were almost linear. The most plausible wave mode is the lower hybrid wave. The PWA has the capability to identify the wave propagation direction and to estimate the corresponding phase velocity using the onboard interferometry system. From the cross correlation in the interferometry system, we estimated the phase velocity of the packet-like waves to be about 60 km/s. To examine the generation mechanism of the observed lower hybrid waves, we conducted linear dispersion analyses using realistic parameters. Since there was poor correlation between the plasma measurements and the lower hybrid waves, we expect the rocket traversed out of the generation region. As the generation mechanism, we propose the lower hybrid waves excited by electron beams. We calculate the linear dispersion with the existence of electron beams and show the lower hybrid waves are destabilized by electron beams. Under the assumption of an electron beam in the generation region, we found that waves in the frequency range around 3 kHz to 4 kHz were excited with the maximum growth rate just below the lower hybrid resonance frequency. Their frequency was in good agreement with the packet-like waves.