The non-expansive auroral disturbance events: a fundamental class

Details The non-expansive auroral disturbance events: a fundamental class The non-expansive auroral disturbance events: a fundamental class

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51b0814g&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM51B-0814

Mathematics

Logic

2407 Auroral Ionosphere (2704), 2409 Current Systems (2708), 2704 Auroral Phenomena (2407), 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

The phenomenological study of the classical auroral bulge-type substorm by Akasofu (Planet.Space.Sci. 12,273, 1964) can be viewed as not only the first thorough description of an auroral disturbance event but also as the first step towards a classification system. Later, several other types of disturbances have been added. Although all these studies have explored the underlying physics responsible for the disturbances the fundamental criteria used for the identification has been the observed emission pattern of the auroral disturbance. Several papers have argued that the ionospheric electrojet system during substorms consist of a directly driven component and an unloading component. The former is driven by merging and reconnection processes while the latter is due to the presence of the substorm current wedge which is responsible for unloading of energy stored in the magnetotail. Gjerloev et al. (submitted to GRL) advocated that although the emission pattern itself is interesting, the classification parameter should be the physical processes responsible for the event. Based on the two fundamental processes which take place during an auroral disturbance event we argue that two fundamental classes of exist: 1) the poleward expanding disturbance (i.e. classical substorm), and 2) the non-expanding disturbance (i.e. crescent auroras, horseshoe, horse-collar, pressure pulse, convection bays). While the substorm current wedge is known to be an integrated part of the first class we show that they do not play any significant role in the second class. Naturally, these two classes have sub-classes thereby including previously published disturbances.

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