Abudayyeh, H.A., Barghouthi, I.A., Al-Sarsour, G. and Alsamamra, H. 2015. DE-1 versus Cluster spectral density observations: the effect on ion outflow above the polar cap. Annals of Geophysics. 58, 5 (Nov. 2015), G0547. DOI:https://doi.org/10.4401/ag-6800.