Dependence of hydromagnetic energy spectra near L=2 and L=3 on upstream solar wind parameters.

This study provides two examples of such a transmission. Magnetospheric hydromagnetic energies are computed at hourly intervals for four period bands in the Pc3-5 range (15-30, 30-60, 60-120 and 120-240 s). We use the horizontal component of magnetometer data recorded at AT&T Bell Laboratories and AFGL stations near L=2 and L=3 during Jan. 27-30, 1979, an interval of moderate geomagnetic activity.