Equatorial spread F fossil plumes

Abstract. Behaviour of equatorial spread F (ESF) fossil plumes, i.e., ESF plumes that have stopped rising, is examined using the NRL SAMI3/ESF three-dimensional simulation code. We find that fossil bubbles, plasma density depletions associated with fossil plumes, can persist as high-altitude equatorial depletions even while being "blown" by zonal winds. Corresponding airglow-proxy images of fossil plumes, plots of electron density versus longitude and latitude at a constant altitude of 288 km, are shown to partially "fill in" in most cases, beginning with the highest altitude field lines within the plume. Specifically, field lines upon which the E field has fallen entirely to zero are affected and only the low altitude (≤600 km) portion if each field line fills in. This suggests that it should be possible to observe a bubble at high altitude on a field line for which the corresponding airglow image no longer shows a depletion. In all cases ESF plumes stop rising when the flux-tube-integrated ion mass density inside the upper edge of the bubble is equal to that of the nearby background, further supporting the result of Krall et al. (2010b).

[1]  J. D. Huba,et al.  Global modeling of equatorial plasma bubbles , 2010 .

[2]  J. Huba,et al.  Why do equatorial ionospheric bubbles stop rising? , 2010 .

[3]  H. Lühr,et al.  Field-aligned current associated with low-latitude plasma blobs as observed by the CHAMP satellite , 2010 .

[4]  J. Retterer.  Forecasting low-latitude radio scintillation with 3-D ionospheric plume models: 1. Plume model , 2010 .

[5]  T. Yokoyama,et al.  Density enhancements associated with equatorial spread F , 2010 .

[6]  P. Bernhardt,et al.  Self‐consistent modeling of equatorial dawn density depletions with SAMI3 , 2010 .

[7]  J. Huba,et al.  Three‐dimensional equatorial spread F modeling: Zonal neutral wind effects , 2009 .

[8]  J. Fedder,et al.  Ion and electron temperature evolution during equatorial spread F , 2009 .

[9]  Takashi Maruyama,et al.  Equinoctial asymmetry of a low-latitude ionosphere-thermosphere system and equatorial irregularities: evidence for meridional wind control , 2009 .

[10]  S. Zalesak,et al.  Three-dimensional simulation of equatorial spread-F with meridional wind effects , 2009 .

[11]  J. Huba,et al.  Atomic and molecular ion dynamics during equatorial spread F , 2009 .

[12]  J. Huba,et al.  Three‐dimensional modeling of equatorial spread F airglow enhancements , 2009 .

[13]  J. Huba,et al.  Three‐dimensional equatorial spread F modeling , 2008 .

[14]  Keith M. Groves,et al.  Ionospheric scintillation effects on single frequency GPS , 2008 .

[15]  A. Patra,et al.  Identification of active fossil bubbles based on coordinated VHF radar and airglow measurements , 2007 .

[16]  J. Huba,et al.  Equatorial spread F modeling: Multiple bifurcated structures, secondary instabilities, large density ‘bite‐outs,’ and supersonic flows , 2007 .

[17]  T. Yokoyama,et al.  Plasma blobs and irregularities concurrently observed by ROCSAT‐1 and Equatorial Atmosphere Radar , 2006 .

[18]  Jonathan J. Makela,et al.  A review of imaging low-latitude ionospheric irregularity processes , 2006 .

[19]  I. Batista,et al.  Thermospheric meridional wind control of equatorial spread F and evening prereversal electric field , 2006 .

[20]  R. W. Spiro,et al.  Simulation study of penetration electric field effects on the low‐ to mid‐latitude ionosphere , 2005 .

[21]  O. Beaujardiere,et al.  C/NOFS: a Mission to Forecast Scintillations , 2004 .

[22]  D. Drob,et al.  Nrlmsise-00 Empirical Model of the Atmosphere: Statistical Comparisons and Scientific Issues , 2002 .

[23]  Glenn Joyce,et al.  Sami2 is Another Model of the Ionosphere (SAMI2): A new low-latitude ionosphere model , 2000 .

[24]  David L. Hysell,et al.  An overview and synthesis of plasma irregularities in equatorial spread F , 2000 .

[25]  Ludger Scherliess,et al.  Radar and satellite global equatorial F-region vertical drift model , 1999 .

[26]  R. Schunk,et al.  Ionosphere-thermosphere space weather issues , 1996 .

[27]  K. Hocke,et al.  A review of atmospheric gravity waves and travelling ionospheric disturbances: 1982-1995 , 1996 .

[28]  Xiaoqing Pi,et al.  Onset conditions for equatorial spread F , 1992 .

[29]  G. Haerendel,et al.  Theory for modeling the equatorial evening ionosphere and the origin of the shear in the horizontal plasma flow , 1992 .

[30]  Michael C. Kelley,et al.  Digital ionosonde observations during equatorial spread F , 1986 .

[31]  S. Ossakow,et al.  The morphology of a multi‐bubble system in the ionosphere , 1983 .

[32]  Sidney L. Ossakow,et al.  Nonlinear equatorial spread F: The effect of neutral winds and background Pedersen conductivity , 1982 .

[33]  S. Ossakow.  Spread-F theories—a review , 1981 .

[34]  H. Booker,et al.  Scattering of radio waves by the F-region of the ionosphere , 1938 .