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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3763

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Title: Dynamics of high-latitude patches and associated small-scale irregularities during the October and November 2003 storms
Authors: De Franceschi, G.*
Alfonsi, Lu.*
Romano, V.*
Aquino, M.*
Dodson, A.*
Mitchell, C. N.*
Spencer, P.*
Wernik, A. W.*
Keywords: Ionospheric scintillations
Polar patches
GPS
Plasma dynamics
Issue Date: Jul-2007
Publisher: Elsevier
Title of journal: Journal of Atmospheric and Solar-Terrestrial Physics
Series/Report no.: /70 (2008)
Abstract: Observations from a network of specially equipped GPS scintillation receivers in Northern Europe are used to investigate the dynamics of ionospheric plasma during the storm events of 30 October and 20 November 2003. The total electron content (TEC) and scintillation data, combined with ionospheric tomography produced by the multi-instrument data analysis system (MIDAS), reveal strong enhancements and steep gradients in TEC during nighttime under a prevailing negative Bz component of the interplanetary magnetic field (IMF). Amplitude and phase scintillation maxima are often co-located with the TEC gradients at the edge of plasma patches, revealing the presence of small-scale irregularities and suggesting association with a tongue of ionization (TOI) convecting in an anti-sunward direction from the American sector across the polar cap. Similarities and differences between the ionospheric response to the two storms are investigated. The 30 October event reveals a quite complex scenario showing two phases of plasma dynamics: the former reflects the expected convection pattern for IMF Bz southward and the latter possibly indicates a sort of TEC plasma stagnation signature of the more complex convection patterns during several positive/negative excursions of IMF Bz.
URI: http://hdl.handle.net/2122/3763
DOI: 10.1016/j.jastp.2007.05.018
Appears in Collections:05.07.01. Solar-terrestrial interaction
05.07.02. Space weather
01.02.99. General or miscellaneous
Papers Published / Papers in press
01.02.04. Plasma Physics

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