Premium
Sign‐singularity analysis of current disruption
Author(s) -
Consolini Giuseppe,
Lui Anthony T. Y.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900355
Subject(s) - singularity , sign (mathematics) , physics , scaling , substorm , exponent , self organized criticality , oscillation (cell signaling) , character (mathematics) , statistical physics , criticality , magnetic field , mathematics , mathematical analysis , quantum mechanics , geometry , magnetosphere , linguistics , philosophy , nuclear physics , biology , genetics
The sign‐singular measure analysis is a new tool to investigate the scaling features of signals which oscillate in sign on an arbitrarily fine scale. In this work, we apply this new tool to the magnetic fluctuations observed before, during, and after tail current disruption (CD). The analysis shows that sign‐singularity is a genuine feature of the magnetic fluctuations in the near‐tail region, and that the character of the sign‐singularity changes during CD. Different values of the sign‐singularity scaling index, named the cancellation exponent κ, are obtained for periods before, during and after the CD. This change of the cancellation exponent is indicative of a reorganization phenomenon, occurring during CD. The results are discussed in connection with magnetospheric substorm onset as well as in the framework of self‐organized criticality and 2 nd phase order transition.