Geotail solar wind "seasons," approximately centered on times 
of noon crossings of local times of apogee.

1995-03-13  1995-10-09
1996-03-27  1996-10-23
1997-04-10  1997-11-06
1998-04-24  1998-11-20
1999-05-08  1999-12-04
2000-05-22  2000-12-18
2001-06-05  2001-12-31
2002-06-19  2003-12-31

2003-01-01  2003-01-14
2003-07-03  2003-12-31

2004-01-01  2004-01-28
2004-07-17  2004-12-31

2005-01-01  2005-02-11
2005-07-31  2005-12-31

2006-01-01  2006-02-25
2006-08-14  2006-12-31