Statistical investigation of Na layer response to geomagnetic activity using resonance scattering measurements by Odin/OSIRIS. Issue 12 (28th June 2017)

• Record Type: Journal Article
• Authors: Tsuda, T. T.; Nakamura, T.; Ejiri, M. K.; Nishiyama, T.; Hosokawa, K.; Takahashi, T.; Gumbel, J.; Hedin, J.
• Is Part Of: Geophysical research letters. Volume 44:Issue 12(2017)
• Page Start: 5943
• Page End: 5950
• Publication Date: 2017-06-28
• Subjects: Na layer -- geomagnetic activity -- Odin/OSIRIS -- energetic particle precipitation -- ion chemistry; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2017GL072801
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: We have performed a statistical investigation of the global response of the Na layer to geomagnetic activity using Na density data from 2004 to 2010 obtained using the Optical Spectrograph and Infrared Imager System (OSIRIS) on board the Odin satellite. In the analysis, we categorized the Na density data according to the auroral electrojet ( A E ) index and then compared the resulting data sets. Regarding the results, we found a significant decrease in the Na density above a height of ∼95 km in both the southern and northern polar regions with an increase in the A E index. The cause of the decrease in the Na density is discussed, and we conclude that the decrease in the Na density was mainly due to the effect of energetic particle precipitation. Key Points: First statistical result on the global Na layer response to the geomagnetic activity Significant Na decrease above 95 km height in both polar regions during the higher A E index Evidence that Na decrease and the Na + increase are induced by particle precipitation