Simultaneous Observations of pi 2 Pulsations on the Satellite and Geound-Based Measurements

Details Simultaneous Observations of pi 2 Pulsations on the Satellite and Geound-Based Measurements Simultaneous Observations of pi 2 Pulsations on the Satellite and Geound-Based Measurements

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jass...14..275l&link_type=abstract

Journal of Astronomy and Space Sciences, vol. 14, no. 2, p. 275-285.

Astronomy and Astrophysics

Astronomy

Scientific paper

We have investigated Pi2 pulsations which were observed both on ground magnetometer array and by satellites. On November 9th in 1994, pi2 pulsations appeared globally on the 190/210 magnetometer chain and Hermanus station when two satellites(EXOS-D and ETS-VI) were located near the magnetic meridian of the 210 array. The local time of measurements covers form morning(LT=8.47hr) to afternoon(LT=20.3hr) and the bandwidth of peak frequency is found relatively small. The signals of the electric field measurement of board the EXOS-D, which is located inside the plasmasphere(L=2.35), are highly coherent with the ground-based observations with the out of phase oscillations. However, the magnetic field measurement on the ETS-VI in the outer magnetosphere(L=6.60) shows no signature of pi2 pulsations over the same time interval and the correlation with any of ground-based stations is found to be very weak, even though both satellites and magnetometer chain are located close to each other in local time. We suggest that this event may be a direct evidence of Pi2 pulsations as virtual resonant modes which are localized in the plasmasphere(Lee 1996). The results show that the cavity mode oscillations can occur in the inner magnetosphere with less spectral noise compared to the outer magnetospheric case.

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