Hurricane intensity changes associated with geomagnetic variation |
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| Institution: | 1. Department of Physics, The College of William and Mary, Box 8795, Williamsburg, VA, USA;2. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA, USA;3. Harvard Smithsonian Center for Astrophysics, Atomic and Molecular Physics Division, Cambridge MA, USA;4. Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, D-38116 Braunschweig, Germany;5. University of Massachusetts, Dept. of Environmental, Earth & Atmospheric Sciences, Lowell MA, USA;6. Science Directorate, NASA Langley Research Center, Hampton, VA, USA;7. Department of Physics, Astronomy and Geophysics, Connecticut College, 270 Mohegan Avenue, New London, CT, USA |
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| Abstract: | Recently some indications have appeared that several purely meteorological processes in the terrestrial atmosphere are dependent upon magnetosphere variations. To analyse the possible relationship with North Atlantic hurricane intensification, the authors examine geomagnetic data for ten days prior to all hurricanes over the last 50 years (1950–1999). A significant positive correlation between the averaged Kp index of global geomagnetic activity and hurricane intensity as measured by maximum sustained wind speed is identified for baroclinically-initiated hurricanes. Results are consistent with a mechanism whereby ionization processes trigger glaciation at cloud top which leads to hurricane intensification through upper tropospheric latent heat release. |
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