19th European Cosmic Ray Symposium. Magnetospheric effects in cosmic rays during the unique magnetic storm in November 2003. Belov A., Baisultanova L., Eroshenko E., Yanke V. (IZMIRAN, Russia), Mavromichalaki H. (Athens University, Greece),
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Magnetospheric effects in cosmic rays
during the unique magnetic storm in November 2003
Yanke V. (IZMIRAN, Russia),
Mavromichalaki H. (Athens University, Greece),
Pchelkin V. (PGI, Russia)
e-mail: [email protected]
2004, Florence, Italy
Aurora in Athens.
Counting rate at different NMs uncorrected for magnetospheric effect. FD is moderate despite of severe magnetic storm
Global Survey Method (GSM):
1. Coupling coefficients- beyond the atmosphere;
2. Trajectory calculations-beyond magnetosphere ;
3. Spherical analysis-to select different harmonics;
Counting rate -> isotropic part+3D anisotropy
Data from 39 NMs : 15 high latitudinal (<1.2 GV), 22 – mid latitude and 2 NMwith Rc>10GV
Maximum in latitudinal distribution of dRc is found around 7-8 GV (usually 3-4 GV) that means ring current to be located at 3R.
dRc variations in dependence on cut-off rigidity in the maximum of geomagnetic storm 20.11.03, derived from experimental CR data (circles) and calculated by the Tsyganenko (T01storm) model (red).
1. Good agreement under Rc>6 GV;
2. Disagreement at Rc<6GV may be caused by inadequacy of model under great magnetospheric disturbances;
3. Experimental methods applied to other magnetic storms gives the classical latitudinal dRc variations with the maximum around 3-4GV
Compare current systems obtained directly from experimental data and current systems obtained from models T01s, M01, A03 for tow values of Dst -70 and -140 nT.
Currents from the model of Alexeev et al. [2001, 2003]
Currents obtained from the database by Fairfield et al. 1994].
Currents obtained from the database Tsyganenko et al. .