Abstract
Riometer recordings made at high geomagnetic latitudes frequently show intense and sporadic absorption that is correlated with the occurrence of auroral and geomagnetic disturbance in a somewhat ill-defined way. This phenomenon is usually referred to by the general term ‘auroral absorption,’ and its statistical characteristics have been investigated by a number of authors. In particular, a subclass of auroral absorption events has been found by Parthasarathy and Berkey [1965] to be closely associated with the unstable ‘break-up’ phase of visible auroral displays. These absorption events, denoted by them as ‘type F’ events, have a characteristically rapid onset time (often a fraction of a minute) and a much slower recovery time, sometimes with a great deal of fine temporal structure.
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