Erlangen 2018 – scientific programme

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UP: Fachverband Umweltphysik

UP 8: Methods - measurement techniques; Atmosphere - trace gases, mesosphere

UP 8.7: Talk

Wednesday, March 7, 2018, 15:30–15:45, G 1.011

About 27-day signatures in standard phase height measurements above Europe — •Christian von Savigny¹, Dieter H. W. Peters², Günter Entzian², and Georg Teiser¹ — ¹Ernst-Moritz-Arndt-University of Greifswald, Greifswald, Germany — ²Leibniz-Institute of Atmospheric Physics, University of Rostock, Kühlungsborn, Germany

We report on 27-day signatures in standard phase height measurements performed using a radio transmitter in central France and a receiver in Kühlungsborn (54° N, 12° E, Mecklenburg, Germany). Using the superposed epoch analysis technique solar 27-day signatures with amplitudes of several tens of meters are found. The statistical significance of the obtained results was tested with a Monte-Carlo approach and the solar 27-day signatures are found to be highly significant. The sensitivity parameter for the 27-day solar response of standard phase height is in good agreement with the sensitivity parameter for the 11-year solar cycle. Surprisingly, the amplitude of the 27-day signature is larger during solar minimum than during solar maximum. In addition, distinct differences in the signature's amplitude with season exist. These findings indicate that the observed effects are not exclusively driven by photochemical effects, but that dynamical processes play an important role, especially in winter.