The correlation of ~ 27 day period solar activity and daily maximum temperature in continental Australia

We report the first observation of a ~27 day period component in daily maximum temperature recorded at widely spaced locations in Australia. The ~27 day component, extracted by band pass filtering, is correlated with the variation of daily solar radio flux during years close to solar minimum. We demonstrate that the correlation is related to the emergence of regions of solar activity on the Sun separated, temporally, from the emergence of other active regions. In this situation, which occurs only near solar minimum, the observed ~27 day variation of temperature can be in-phase or out-of-phase with the ~27 day variation of solar activity. During solar maximum correlation of temperature and solar activity is much less defined. The amplitude of the ~27 day temperature response to solar activity is large, at times as high as 6C, and much larger than the well documented temperature response to the ~11 year cycle of solar activity. We demonstrate that the ~27 day temperature response is localised to the Australian continent and increases towards the centre of the continent. Several aspects of the ~27 day temperature response are consistent with a ~27 day period solar input to the Earth’s continents generating large scale planetary waves.