On the response of the neutral temperature at 78°N and 90 km altitude to solar proton events

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概要

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• We are able to determine neutral air temperatures by examining the fading times of meteor trail echoes in the upper mesosphere/lower thermosphere. It has been suggested that solar proton events may stimulate both dynamic and aeronomic changes in the middle atmosphere and we have endeavoured to investigate this. Despite a variety of approaches to determine the background temperature above which we might expect to see enhancements under conditions of strong proton precipitation, we are unable to detect any significant changes. We have repeated the search during selected seasons and also with various proton flux thresholds, similarly to no avail. We conclude, therefore, that at 90 km altitude, 78°N and 16°E, at least, we are unable to detect enhanced neutral temperatures due to solar proton events. At best, any enhancements, predicted to be of the order of a few K only, are likely to be completely masked by the day-to-day variability of the temperature field.

著者

• Hall C.M.

  Tromso Geophysical Observatory, Norway

• Aso T.

  National Institute of Polar Research

• Tsutsumi M.

  National Institute of Polar Research

• Hall C.m.

  Tromso Geophysical Observatory Norway

• Hall C.m.

  Tromsø Geophysical Observatory University Of Tromsø

関連論文

• On the response of the neutral temperature at 78°N and 90 km altitude to solar proton events
• Atmospheric stability at 90Km, 78°N, 16°E
• Identification of possible ion-drag induced neutral instability in the lower thermosphere over Svalbard
• 20th century operation of the Tromsø Ionosonde
• Simultaneous measurements of dynamical structure in the mesopause region with lidars and MU radar

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