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TitleSeasonal and solar cycle variations in the ionospheric convection reversal boundary location inferred from monthly SuperDARN data sets
AuthorKoustov, A V; Fiori, R A DORCID logo
SourceAnnales Geophysicae vol. 34, 2016 p. 227-239, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20160037
PublisherCopernicus GmbH
Mediapaper; on-line; digital
File formathtml; pdf
Subjectsextraterrestrial geology; Health and Safety; solar cycles; solar variations
ProgramPublic Safety Geoscience Northern Canada Geohazards Project
Released2016 02 15
Multi-year (1995-2013) velocity data collected by the Super Dual Auroral Network (SuperDARN) HF radars are considered to investigate seasonal and solar cycle variations of the convection reversal boundary (CRB) location for interplanetary magnetic field (IMF) . By considering monthly datasets we show that the CRB is at higher latitudes in summer between 1995 and 2007. The poleward shifts are on the order of 2°-5°. After 2007, the seasonal effect weakens, and the highest latitudes for the CRB start to occur during the winter time. We show that the CRB latitudes decrease with an increase of the IMF transverse component at a rate of (1°-2°)/2nT. Because of this effect, on average, the CRB latitudes are lower during high solar activity periods with stronger IMFs. We also confirm the effect of the CRB dawn-dusk shifts related to the IMF changes in the IMF sign.
Summary(Plain Language Summary, not published)
Space weather refers to the dynamic conditions on the Sun and in the space environment, in particular, in the near-Earth environment, that can affect critical infrastructure. NRCan operates the Canadian Space Weather Forecast Centre and conducts research into space weather effects on power systems, pipelines, radio communications and GNSS positioning to help Canadian industry understand and mitigate the effects of space weather. Ionospheric plasma flow is ultimately driven by the interaction between the solar wind, interplanetary magnetic field, and the geomagnetic field. The intensity of plasma flow over the polar cap can be thought of as both the degree to which the solar wind couples to the magnetosphere, and as an indicator for the amount of energy flowing into and throughout the magnetosphere-ionosphere system. This paper presents the long-term variation in the location of the convection reversal boundary inferred from the Super Dual Auroral Radar Network (SuperDARN).

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