Long Duration Recovery Phase of Magnetic Storms

1. Name of Database:  Long Duration Recovery Phase of Magnetic Storms

2. Institution:  Solar-Terrestrial Environment Laboratory, Nagoya University

3. Contents of Database:

A geomagnetic storm lasts usually a few to several days in duration.  However, sometimes 
the recovery phase of a geomagnetic storm lasts one to two weeks or even longer.. According 
to Tsurutani and Gonzalez (1987), this type of long-duration geomagnetic storms is called 
HILDCAAs (High-Intensity Long-Duration Continuous AE Activity).  It was suggested that 
continuous injections to the ring current take place such that the ring current does not, 
or cannot, decay rapidly. 

The aim of this database is to analyze in detail the following eight HILDCAAs events that 
occurred in 1998.

　March   11-17
　April   24-28
　May      7-12
　June     3-11
　July    22-25
　August  22-25
　August  28-September 01
　October 20-25

4. Example of Database:

Geomagnetic activity and the corresponding solar wind conditions on March 10-17, 1998.  
From top to bottom, interplanetary magnetic field (magnitude and the north-south component), 
proton density, and bulk speed of the solar wind, and the Dst index.  The two vertical lines 
on Dst indicate the beginning and peak times of the geomagnetic storm.



5. Contact:

　Prof. Y. Kamide
　Solar-Terrestrial Environment Laboratory, Nagoya University
　Honohara 3-13, Toyokawa, Aichi 442-8507, Japan
　FAX: +81-533-89-5090
　kamide[AT]stelab.nagoya-u.ac.jp

6. Public Offering Database:

　　

S-RAMP Database Catalog.

S-RAMP Home Page.