[PEM18-P04] Study on geomagnetic responses of Na, Mg, and Mg+ layers based on Envisat/SCIAMACHY observations
Keywords:Metallic atom layers, Metallic ion layers, Auroral activity, Envisat/SCIAMACHY
In this study, we investigated the geomagnetic responses in the Na, Mg, and Mg+ layers using the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) onboard the Envisat. The results showed a significant decrease in the Na density at heights above 95 km at latitudes above 50ºS during geomagnetically active periods. In contrast, a significant increase in the Mg+ density was found at heights above 105 km at latitudes above 40ºS during geomagnetically active periods. The most probable explanation for the Na and Mg+ responses is the charge-transfer reactions triggered by ionization due to energetic particle precipitation during geomagnetically active periods.