Wave characteristics of daytime and nighttime Pi 2 pulsations at the equatorial and low latitudes

Details Wave characteristics of daytime and nighttime Pi 2 pulsations at the equatorial and low latitudes Wave characteristics of daytime and nighttime Pi 2 pulsations at the equatorial and low latitudes

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.22792&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 18, p. 2279-2282

Physics

2

Ionosphere: Equatorial Ionosphere, Ionosphere: Ionosphere/Magnetosphere Interactions, Magnetospheric Physics: Mhd Waves And Instabilities

Scientific paper

Peculiarities of daytime and nighttime Pi 2 pulsations at the dip equator are examined by using multipoint measurements from the 210° magnetic meridian (MM) magnetometer network. We found that during daytime the amplitude of Pi 2 pulsations at the dip equator is enhanced, and the phase lags ~34° behind those at low-latitude (magnetic latitude Φ=19.5-46.2°) stations. On the other hand, during nighttime the amplitude of Pi 2 pulsations at the dip equator is depressed, and the phase lags ~18°behind those at the lower latitudes. Because the zonal ionospheric conductivity at the dip equator is much higher than that at the off-dip equator region, Pi 2 signals are expected to be distorted more effectively at the dip equator. The observations imply that the daytime and nighttime Pi 2 pulsations in the equatorial and low-latitude regions can be explained by invoking an instantaneous penetration of electric field variations from the nightside polar ionosphere to the dayside equatorial ionosphere, and a direct incidence of compressional oscillations from the nightside inner magnetosphere, respectively.

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