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Mid-latitude atmosphere electric field (Ez) variations during the main phase of the 30 October magnetic storm
Nikiforova N. N., Kozyreva O. V., Kleimenova N. G., Kubicki M., Michnowski S.,
In this report we analyzed the atmosphere electric field (Ez) variations at Polish obs. Swider (æ=48) during October 2003 superstorms. Such observations are representative only under the 'fair weather' conditions, i.e. the absence of the local meteorological disturbances introduced by precipitation, fog, blizzards, wind stronger than 6 m/s and low cloudiness above the station. Unfortunately, during the October and November 2003 Solar events the 'fair weather' condition was observed only in the interval of 21-24 UT on 30 October, which matched to the main phase of the strongest magnetic storm of these Solar events. The typical Ez values at obs. Swider at October 'fair-weather' are positive and reach by about 250-300 V/m. Very unusual negative Ez bursts up to -150 V/m appeared in the interval of 21-24 UT on 30 October. Their occurrence was coincided with strong magnetosphere substorm, which amplitude even at obs. Belsk (æ=47 ) reached 250 nT, and strong energetic electron precipitation (riometer absorption up to 4 dB) in south Finland (obs. Jyvaskyla). Applying spectral analysis we compared the properties of geomagnetic, riometer and Ez fluctuations. We conclude that the observed extreme great effect in the mid-latitude atmosphere electric field (Ez) variations demonstrates the strong influence of the storm associated ionosphere disturbances to the global electric circuit.