Space Research Institute RAS, Russia
Posters-Accepted Abstracts: J Aeronaut Aerospace Eng
A multi-point study at lowest frequency resonances at the outer magnetospheric boundaries on the fluctuations inside the magnetosphere is presented. The correlations of the dynamic pressure data from CLUSTER, DOUBLE STAR, GEOTAIL, ACE/ WIND, particle data from LANL, Goes with the magnetic data from polar ionospheric stations on March 27, 2005, show that: i) The boundary resonances and their harmonics penetrate inside the magnetosphere; ii) Correlations between the dynamic pressure fluctuations and magnetospheric disturbances can exceed 80%; iii) The new resonance frequencies are lower by an order of magnitude compared with our previous studies being down to 0.02 MHz Analysis of different types of correlations shows that in ~48% of the cases with pronounced maximum in the correlation function the geosynchronous/ionospheric response is seen BEFORE the magneto sheath (MSH) reactions. We propose that some global magnetospheric resonances (e.g. membrane bow shock (0.2-0.5 MHz) and/or magnetopause (0.5-0.9 MHz) modes along with the cavity MHS/ cusp (3-10 MHz) and magnetospheric global modes (0.02-0.09 MHz)) can account for the data presented. Namely, the particular jets at the sampled MSH points can be a consequence of the resonances, while initial disturbance, resulted in the resonance excitations (e.g. through the SW fluctuations at frequencies being close to the resonance ones, interplanetary shocks, Hot Flow Anomalies, foreshock irregularities etc.), passed beside some MSH spacecraft.