Periodicities of polar cap patches
نویسندگان
چکیده
منابع مشابه
ESR mapping of polar-cap patches in the dark cusp
[1] We present the first ever measurement of the full thermal plasma properties, of an ionospheric patch in full darkness in the noon region where patches are believed to form. Further these data present the first experimental evidence for the Lockwood and Carlson class of mechanisms for forming patches by plasma injection. These data were possible only because of a new measurement capability w...
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 کاملOn the possible role of cusp/cleft precipitation in the formation of polar-cap patches
The work describes experimental observations of enhancements in the electron density of the ionospheric F-region created by cusp/cleft particle precipitation at the dayside entry to the polar-cap convection ̄ow. Measurements by meridian scanning photometer and all-sky camera of optical red-line emissions from aurora are used to identify latitudinally narrow bands of soft-particle precipitation ...
متن کاملMotion 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 کاملPolar cap influx
This study uses digital ionosonde data from a cusp latitude station (Cambridge Bay, 77 CGM lat.) to study the convection into the polar cap. Days when the IMF magnetic field was relatively steady were used. On many days it was possible to distinguish an interval near noon MLT when the ionosonde data had a different character from that at earlier and later times. Based on our data, and other pub...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2013
ISSN: 2169-9380
DOI: 10.1029/2012ja018165