Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 1.490
IF1.490
IF 5-year value: 1.445
IF 5-year
1.445
CiteScore value: 2.9
CiteScore
2.9
SNIP value: 0.789
SNIP0.789
IPP value: 1.48
IPP1.48
SJR value: 0.74
SJR0.74
Scimago H <br class='widget-line-break'>index value: 88
Scimago H
index
88
h5-index value: 21
h5-index21
Volume 28, issue 11
Ann. Geophys., 28, 2059–2069, 2010
https://doi.org/10.5194/angeo-28-2059-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 28, 2059–2069, 2010
https://doi.org/10.5194/angeo-28-2059-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  09 Nov 2010

09 Nov 2010

Equatorial spread F fossil plumes

J. Krall1, J. D. Huba1, S. L. Ossakow2, and G. Joyce3 J. Krall et al.
  • 1Plasma Physics Division, Naval Research Laboratory, Code 6790, 4555 Overlook Ave., SW, Washington, D.C., 20375-5000, USA
  • 2Berkeley Research Associates, Beltsville, MD 20705-1434, USA
  • 3Icarus Research, Inc., P.O. Box 30780, Bethesda, MD 20824-0780, USA

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).

Publications Copernicus
Download
Citation