PROCEDURE: load_ace_mag PURPOSE: loads ACE MAG Experiment key parameter data for "tplot". INPUTS: none, but will call "timespan" if time_range is not already set. KEYWORDS: DATA: Raw data can be returned through this named variable. TIME_RANGE: 2 element vector specifying the time range. MASTERFILE: (String) full filename of master file. POLAR: Computes B field and SC position in polar coordinates. SEE ALSO: "loadallhdf" CREATED BY: Peter Schroeder Modified by D. Larson 5/2008 to automatically download files from the ACE data center (masterfile is ignored) LAST MODIFIED: @(#)load_ace_mag.pro 1.2 02/04/12