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Two components of ionospheric plasma structuring at midlatitudes observed during the large magnetic storm of October 30, 2003
Center for Space Physics, Boston University, Boston, Massachusetts, USA
Space Vehicles Directorate, Air Force Research Laboratory, Hanscom Air Force Base, Massachusetts, USA
Department of Electrical and Computer Engineering, University of Illinois, Urbana, Illinois, USA
Institute for Scientific Research, Boston College, Newton Center, Massachusetts, USA
Institute for Scientific Research, Boston College, Newton Center, Massachusetts, USA
Institute for Scientific Research, Boston College, Newton Center, Massachusetts, USA
Cooperative Institute for Research in Environmental Sciences, University of Colorado/NOAA, Boulder, Colorado, USA
Charged Particle Physics Branch, Naval Research Laboratory, Washington, D. C., USA
Center for Space Physics, Boston University, Boston, Massachusetts, USA
Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Space Dynamics Laboratory, Department of Physics, Utah State University, Logan, Utah, USA
We consider VHF amplitude scintillations, GPS phase fluctuations, ionosonde measurements, maps of GPS total electron content (TEC), observations of daytime aurora and TIMED GUVI images during the large magnetic storms of October 29–31, 2003, and find two distinct classes of plasma processes that produce midlatitude ionospheric irregularities. One is associated with auroral plasma processes; the other, with storm enhanced density (SED) gradients, a part of which occur in close proximity to sub-auroral polarization stream (SAPS) electric fields as discussed by J. C. Foster et al. (2002). We analyze in detail the storm event of October 30, 2003. The SAPS-associated plasma structures may occur by an ion temperature gradient convective instability (M. J. Keskinen et al., 2004), but structuring by auroral processes requires elucidation.
Received 1 October 2004; accepted 28 February 2005; published 29 April 2005.
Citation: (2005), Two components of ionospheric plasma structuring at midlatitudes observed during the large magnetic storm of October 30, 2003, Geophys. Res. Lett., 32, L12S06, doi:10.1029/2004GL021669.
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