A new approach for monitoring the 27-day solar rotation using VLF radio signals on the Earth's surface

Details A new approach for monitoring the 27-day solar rotation using VLF radio signals on the Earth's surface A new approach for monitoring the 27-day solar rotation using VLF radio signals on the Earth's surface

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11410306r&link_type=abstract

Journal of Geophysical Research, Volume 114, Issue A10, CiteID A10306

Physics

1

Atmospheric Processes: Atmospheric Electricity, Ionosphere: Ionosphere/Atmosphere Interactions (0335), Radio Science: Radio Wave Propagation, Atmospheric Processes: Lightning, Radio Science: Electromagnetic Noise And Interference

Scientific paper

Typical solar parameters such as sunspot number, Lyman alpha radiation, and 10.7 cm radio flux exhibit 27-day variations associated with the rotation of the Sun. We have discovered a robust indicator of this 27-day rotation from measurements of VLF radio signals produced by lightning around the globe. The solar rotation signal is found only at VLF frequencies close to the Earth-ionosphere waveguide cutoff frequency (˜2 kHz). Furthermore, the 27-day solar rotation is detected only during daylight hours, implying a 27-day periodicity in the daytime collision frequency between free electrons and neutral air molecules in the lower ionosphere (˜80 km). We propose that continuous monitoring of VLF radio noise at frequencies close to the waveguide cutoff could provide a new method of continuously monitoring changes in the solar rotation rate.

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