A Telescopic and Microscopic View of a Magnetospheric Substorm on 31 March 2001: New CLUSTER Observations of the Near Magnetotail

Details A Telescopic and Microscopic View of a Magnetospheric Substorm on 31 March 2001: New CLUSTER Observations of the Near Magnetotail A Telescopic and Microscopic View of a Magnetospheric Substorm on 31 March 2001: New CLUSTER Observations of the Near Magnetotail

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm21b..02b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM21B-02

Physics

2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

The Research with Adaptive Particle Imaging Detectors (RAPID) experiments onboard the four CLUSTER II spacecraft measure electrons with energies >=20 keV. On 31 March 2001 at ~0635 UT when the CLUSTER constellation had just passed through perigee, the RAPID sensors observed an energetic electron ``injection'' event associated with a strong (AE ~1200 nT) magnetospheric substorm expansion phase onset. The CLUSTER suite of spacecraft were very near local midnight and were at ~4 {RE} geocentric distance. The LANL spacecraft 1991-080 located at ~20 LT also saw a strong electron injection event at ~0630 UT and the FAST spacecraft ( ~19 LT) detected a powerful set of magnetic field, electric field, and energetic particle signatures at ~0637 UT. The energetic neutral atom imaging experiments MENA and HENA onboard the IMAGE spacecraft detected a prominent injection of substorm-produced ions in the pre-midnight sector commencing at ~0650 UT. The RAPID data showed a very clear, phased timing of the electron injection signatures at the four separate CLUSTER locations allowing us to infer the location, speed, and direction of the substorm injection boundary. Hence, CLUSTER (and FAST) allow us to probe microscopic details of a powerful substorm event while IMAGE data give us a global, telescopic view of the same magnetospheric events. This combination is a long-sought realization of a major magnetospheric research objective and shows the powerful new potential role of CLUSTER.

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