Abstract
Pseudobreakup and substorm breakup are compared in two cases when these events followed each other at an interval of about an hour. Both ground-based measurements and data of satellite detectors of charged particles have been used. It has been indicated that pseudobreakups are characterized by a weak intensity of auroral activation and the field-aligned flux of low-energy electrons that caused this activation. In addition, the flux of energetic ions accelerated during pseudobreakup, and the energy of these ions are low as compared to these parameters at a substorm onset. Therefore, the above parameters are ineffective in creation of conditions for development of the following activation. At the same time, the flux of energetic electrons and the ionization degree are high, which results in a considerable release of energy stored in this sector.
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