## 3 Results
### Case on 9 November 2004  
This case occurred during the second storm in a series that lasted from 7 to 10 November 2004. The first was a super storm; the other two began at recovery phases of the previous storm. During the first storm, only an increase in the \(>\)30 keV electron fluxes was observed. The storm on 9 November started with SSC of amplitude \(\sim\) 60 nT at \(\sim\)18:50 UT, followed by the main phase 20 min later. The minimum SYM-H value of \(\sim\)\(-\)250 nT was observed at 21:00 UT. Following the northward turn of \(Bz\), the recovery phase began after \(\sim\)21:00 UT and continued for 7 h until the storm ring current intensified again. During the main phase, three POES satellites did not detect any increase in FEE fluxes in any LT sector (2-14, 6-18, and 10-22 LT).  
The first FEE enhancement was observed at the end of the main phase at \(\sim\)21:10 UT (Table 1, Figure 1). In the morning sector, high-intensity fluxes were simultaneously observed in two energy channels: \(>\)30, and \(>\)100. The satellite was probably located near the region of injection.  
Figure 4 shows geomagnetic and solar wind conditions from 18:00 to 23:00 UT on 9 November 2004. The upper panel presents the SMR-12 index and X-components from the low-latitude stations ASP (23.8\({}^{\circ}\) S, 133.9\({}^{\circ}\) E) and PPT (17.6\({}^{\circ}\) S, 149.6\({}^{\circ}\) W). Local time at 21 UT was \(\sim\)6 h at ASP and 11 h at PPT. Lower panels present the solar wind parameters measured by the Wind monitor at the upstream location of \(\sim\)200 Re. The time delay is estimated at approximately 25 min for the solar wind plasma velocity of \(\sim\)800 km/s.  
Figure 4: Geomagnetic and solar wind conditions on 9 November 2004: **(top)** SuperMAG partial ring current index SMR-12 (black), and X-components of the magnetic field in the morning at ASP (red) and on the pre-noon PPT (blue) stations of the INTERMAGNET network, the offset values are 29,700 nT (ASP) and 29,200 nT (PPT); **(middle and bottom)** the solar wind total pressure \(P\) and IMF components \(Bx\) (black), \(By\) (blue), and \(Bz\) (red), measured by the Wind upstream monitor. The gray arrow indicates the FEE enhancement at early morning.  
In the solar wind within 1 h interval from 21:10 UT, a significant decrease in pressure (~35 nPa) accompanied by a rotation of IMF components can be seen at ~20:30 UT. The \(Bz\) component turned north and became largely positive. The type of magnetic structure is classified as a magnetic cloud. The ground stations ASP (early morning) and PPT (pre-noon) observed rapid decreases of the geomagnetic field by ~60 nT at 21:07 UT and 21:00 UT, respectively. At the same time, the SMR-12 index does not show any decrease in the daytime geomagnetic field. Note that this index is derived as the average over many available stations within the noon sector in a wide (\(\pm\)50\({}^{\circ}\)) latitudinal range. At that time, the end of the main phase, there is a strong effect of the intense ring current at dayside, especially in the post-noon sector. Therefore, in this case, the measurements from individual low-latitude stations are more indicative. The decrease in the daytime magnetic field at low latitudes corresponds to the magnetosphere expansion. Thus, the large negative change in solar wind pressure (\(\Delta\)P < 0) causes an expansion of the magnetosphere, which is revealed from the decrease in the X-component at low-latitude ground stations located on the dayside. A few minutes later, the fluxes of the 30-100 keV quasi-trapped electrons at L-shell of ~1.05 suddenly began to increase at early morning (Table 1).