Variations in the polar cap area during two substorm cycles
نویسندگان
چکیده
منابع مشابه
Motion of the dayside polar cap boundary during substorm cycles: II. Generation of poleward-moving events and polar cap patches by pulses in the magnetopause reconnection rate
Using data from the EISCAT (European Incoherent Scatter) VHF and CUTLASS (Co-operative UK TwinLocated Auroral Sounding System) HF radars, we study the formation of ionospheric polar cap patches and their relationship to the magnetopause reconnection pulses identified in the companion paper by Lockwood et al. (2005). It is shown that the poleward-moving, high-concentration plasma patches observe...
متن کاملMotion of the dayside polar cap boundary during substorm cycles: I. Observations of pulses in the magnetopause reconnection rate
Using data from the EISCAT (European Incoherent Scatter) VHF radar and DMSP (Defense Meteorological Satellite Program) spacecraft passes, we study the motion of the dayside open-closed field line boundary during two substorm cycles. The satellite data show that the motions of ion and electron temperature boundaries in EISCAT data, as reported by Moen et al. (2004), are not localised around the ...
متن کاملPolar cap index comparisons with AMIE cross polar cap potential, electric field, and polar cap area
[1] The polar cap index (PCI) has been shown to be quite useful as an index of the electrodynamic processes within the high-latitude ionosphere. Here we use between 150 and 180 magnetometers to model the high-latitude electrodynamics with the assimilative mapping of ionospheric electrodynamics (AMIE) technique for all of 1997–2001. We compare AMIE calculations of the cross polar cap potential (...
متن کاملTranspolar voltage and polar cap flux during the substorm cycle and steady convection events
[1] Transpolar voltages observed during traversals of the polar cap by the Defense Meteorological Satellite Program (DMSP) F-13 spacecraft during 2001 are analyzed using the expanding-contracting polar cap model of ionospheric convection. Each of the 10,216 passes is classified by its substorm phase or as a steady convection event (SCE) by inspection of the AE indices. For all phases, we detect...
متن کاملPolar cap area and boundary motion during substorms
The area of the polar cap a.s a function of local time and substorm phase was measured using images from the Polar Ultraviolet Imager (UVI) for different interplanetary magnetic field (IMF) orientations during three substorms in January 1997. We measured changes in the polar cap area and motion of the poleward and equatorward boundary of the auroral oval. It was found that the polar cap boundar...
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ژورنال
عنوان ژورنال: Annales Geophysicae
سال: 2003
ISSN: 1432-0576
DOI: 10.5194/angeo-21-1121-2003