Polarity and energetics of inner core lightning in three intense North Atlantic hurricanes

[1] We use the World Wide Lightning Location Network (WWLLN), low-frequency magnetic fields measured at Duke University, and storm intensity data (winds and central pressure) to examine the polarity and energetics of lightning within 100 km of the centers (inner core regions) of North Atlantic hurricanes Emily, Katrina, and Rita (2005). WWLLN provides the lightning locations. Polarities, peak currents, and vertical impulse charge moment changes are derived from the Duke magnetic field measurements. In agreement with past studies, we find episodic inner core lightning outbreaks prior to and during most changes in storm intensity. A new result of our analysis indicates an increase in the relative number of positive cloud-to-ground lightning in the inner core prior to and during periods of storm weakening, which is potentially important for hurricane intensity change forecasting. Additionally, we find that the majority of inner core lightning located by WWLLN had peak currents that surpassed the threshold needed to produce optical emissions (elves) and drive electron density perturbations in the lower ionosphere (80–105 km). Since these high peak current lightning occurred in short-duration outbreaks, they had an accumulated effect on the ionospheric electron density, as shown by recent modeling studies. Our results suggest that the inner core lightning in intense hurricanes might be significant drivers of perturbations in the lower ionosphere during these inner core lightning outbreaks.

[1]  Xiaofan Li,et al.  Effects of Vertical Wind Shear , 2012 .

[2]  T. E. Nelson,et al.  Quantification of the troposphere-to-ionosphere charge transfer in a gigantic jet , 2009 .

[3]  Robert H. Holzworth,et al.  Growing Detection Efficiency of the World Wide Lightning Location Network , 2009 .

[4]  C. Price,et al.  Maximum hurricane intensity preceded by increase in lightning frequency , 2009 .

[5]  T. E. Nelson,et al.  The Meteorological and Electrical Structure of TLE-Producing Convective Storms , 2009 .

[6]  T. E. Nelson,et al.  Coordinated analysis of delayed sprites with high-speed images and remote electromagnetic fields , 2008 .

[7]  S. Businger,et al.  The Morphology of Eyewall Lightning Outbreaks in Two Category 5 Hurricanes , 2008 .

[8]  R. Hsu,et al.  Broadband very low frequency measurement of D region ionospheric perturbations caused by lightning electromagnetic pulses , 2007 .

[9]  Robert H. Holzworth,et al.  Detection efficiency of the VLF World-Wide Lightning Location Network (WWLLN): initial case study , 2006 .

[10]  Robert H. Holzworth,et al.  Performance Assessment of the World Wide Lightning Location Network (WWLLN), Using the Los Alamos Sferic Array (LASA) as Ground Truth , 2006 .

[11]  David P. Yorty,et al.  WHERE ARE THE MOST INTENSE THUNDERSTORMS ON EARTH , 2006 .

[12]  T. E. Light,et al.  Katrina and Rita were lit up with lightning , 2005 .

[13]  S. Cummer,et al.  Implications of lightning charge moment changes for sprite initiation , 2005 .

[14]  Craig J. Rodger,et al.  Location accuracy of VLF World-Wide Lightning Location (WWLL) network: Post-algorithm upgrade , 2005 .

[15]  Robert H. Holzworth,et al.  WWLL global lightning detection system: Regional validation study in Brazil , 2004 .

[16]  K. Corbosiero,et al.  The Effects of Vertical Wind Shear on the Distribution of Convection in Tropical Cyclones , 2002 .

[17]  James B. Brundell,et al.  VLF lightning location by time of group arrival (TOGA) at multiple sites , 2002 .

[18]  E. Zipser,et al.  Reflectivity, Ice Scattering, and Lightning Characteristics of Hurricane Eyewalls and Rainbands. Part I: Quantitative Description , 2002 .

[19]  M. Rycroft,et al.  Lower ionospheric modification by lightning‐EMP: Simulation of the night ionosphere over the United States , 2001 .

[20]  U. Inan,et al.  Modeling ELF radio atmospheric propagation and extracting lightning currents from ELF observations , 2000 .

[21]  V. P. Idone,et al.  Convective Structure of Hurricanes as Revealed by Lightning Locations , 1999 .

[22]  U. Inan,et al.  Elves triggered by positive and negative lightning discharges , 1999 .

[23]  Edward J. Zipser,et al.  Relationships between Tropical Cyclone Intensity and Satellite-Based Indicators of Inner Core Convection: 85-GHz Ice-Scattering Signature and Lightning , 1999 .

[24]  Kenneth L. Cummins,et al.  A Combined TOA/MDF Technology Upgrade of the U.S. National Lightning Detection Network , 1998 .

[25]  Umran S. Inan,et al.  Rapid lateral expansion of optical luminosity in lightning‐induced ionospheric flashes referred to as ‘elves' , 1997 .

[26]  Umran S. Inan,et al.  Sprites produced by quasi‐electrostatic heating and ionization in the lower ionosphere , 1997 .

[27]  R. Fernsler,et al.  Models of lightning-produced sprites and elves , 1996 .

[28]  E. Williams,et al.  Sprites, ELF Transients, and Positive Ground Strokes , 1995, Science.

[29]  V. P. Idone,et al.  Cloud‐to‐ground lightning in Hurricane Andrew , 1994 .

[30]  C. S. Keen,et al.  Observations of Lightning in Convective Supercells within Tropical Storms and Hurricanes , 1994 .

[31]  R. Orville,et al.  Cloud-to-ground lightning in tropical cyclones: A study of Hurricanes Hugo (1989) and Jerry (1989) , 1994 .

[32]  T. Bell,et al.  The interaction with the lower ionosphere of electromagnetic pulses from lightning: Excitation of optical emissions , 1993 .

[33]  Umran S. Inan,et al.  Interaction with the lower ionosphere of electromagnetic pulses from lightning: Heating, attachment, and ionization , 1993 .

[34]  W. J. Burke,et al.  Effects of a lightning discharge detected by the DE 2 satellite over Hurricane Debbie , 1992 .