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From geomagnetic field observations of CHAMP during 2001–2009 we extractedcharacteristic signatures of inter-hemispheric field-aligned currents(IHFACs) in the equatorial ionosphere. The results are in general agreementwith previous observations. Nighttime IHFACs are negligibly small. SolstitialIHFACs flow from the summer to winter (from winter to summer) hemisphere atdawn (around noon). Duskside IHFACs flow southbound irrespective of season.We have also found some new IHFAC properties, which may have been predictedby theories, but are not yet given observational support. IHFACs clearlyexhibit a longitude dependence, which is modulated by the South AtlanticAnomaly, the offset between geographic and magnetic equators, and tidalwaves. IHFACs show little dependence on the solar cycle. We provide acomprehensive assessment of the IHFAC modulation by non-migrating tides

Climatology of the inter-hemispheric field-aligned current system in the equatorial ionosphere as observed by CHAMP