Fine structure of breakup development inferred from satellite and ground-based observations

Abstract

Abstract. More than 60 breakups, including weak activations of the pseudo-breakup type, moderate breakups, and events of very strong auroral activity, were analyzed using ground-based TV data, together with satellite auroral images. We studied the fine subvisual details of spatial and temporal dynamics of active auroral forms and surrounding diffuse luminosity, both in the longitudinal and latitudinal directions of the TV camera field of view. For all types of breakups a close interconnection of auroral activity was found across and along the auroral oval.

Investigations of the auroral luminosity distribution and the dynamics of discrete auroral forms in a historical retrospective

“…In this way Kornilova et al (2006) investigated the structure, dynamics, and correlation of auroral intensifications within the high-latitude and low-latitude boundaries of the auroral oval during substorm intervals. Kornilova et al (2008) examined with 60 auroral substorms the relation between auroral activity in the different parts of the auroral oval near the onset of the substorm expansion phase. Kornilova and Kornilov (2012), finally, described the concurrent existence of equatorward drifting structures in the pole-side part of the nighttime auroral oval and poleward drifting of bright auroral forms in the equator-side part.…”

Connection between the discrete auroral structures drifting equatorward during the substorm expansion phase and the energetic particle injections at the geostationary orbit

“…The essence of the method lies in finding the difference in the auroral luminosity between the initial matrix characterizing the emission intensity in each point of the TV shot and the matrix shifted by several rows (or columns) in ver tical (or horizontal) direction. A detailed description of the television equipment and methods of TV images processing was described in [12][13][14]. The filtration procedure was used to create keograms and that made it possible to detect auroral structures with weak inten sity and to study their dynamics.…”

East‐west type precursor activity prior to the auroral onset: Ground‐based and THEMIS observations

“…The original images and keograms were filtered in order to reveal auroral structures of low intensity and investigate their dynamics (for details of the TV camera and data processing, see Kornilova et al . [] and Kornilova and Kornilov []).…”