A Statistical Study of Sudden Impulse Characteristics to Understand their Space Weather Importance
Abstract
Geomagnetic sudden impulses (SIs) are sharp changes of the horizontal magnetic field which are caused by sudden increases or decreases of the solar wind dynamic pressure at interplanetary shocks and discontinuities. Using existing lists of geomagnetic sudden impulses as well as a survey of SYM-H for SIs, we compared the different reported SI lists to each other and determined characteristics of geomagnetic sudden impulses. We analyzed one year of confirmed sudden impulses. We present distributions of SI amplitudes, rise times, occurrence frequency, time between occurrences, the time rate of change of the geomagnetic field (dB/dt), and the accuracy of published SI lists. We discuss the role of SI as potential sources of geomagnetic induced currents.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMGP0140002L
- Keywords:
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- 2788 Magnetic storms and substorms;
- MAGNETOSPHERIC PHYSICS;
- 4313 Extreme events;
- NATURAL HAZARDS;
- 7904 Geomagnetically induced currents;
- SPACE WEATHER;
- 7934 Impacts on technological systems;
- SPACE WEATHER