Monday

Auroral Kilometric Radiation (AKR) is a cyclotron maser instability-generated radio emission that originates from high latitude magnetic field lines and is associated with strong parallel electric fields. Previous observations of AKR have shown that its intensity generally increases with a more perturbed magnetosphere. Morphological changes of the AKR source regions have also been observed to coincide with substorm onset, with an intensification of the AKR emission often accompanied by a low frequency extension which can be interpreted as an expansion of the source region to higher altitudes along the field line. Although it is the most intense terrestrial radio emission, its directivity and source region localisation mean that AKR observations are highly dependent on observer local time and latitude. Using a recently developed selection technique, we isolate AKR from Wind radio observations made over a decade and examine the observations with respect to the spacecraft viewing position, accounting for such effects. We then use event lists of substorm phases that cover the same period to examine the average AKR characteristics with respect to the substorm timeline, expanding on the breadth of previous studies and gaining an unprecedented insight into the AKR response. In this way, we examine the use of AKR as a proxy for the state of the magnetospheric disturbance during substorms and the variability in the magnetosphere-ionosphere coupling during these events.