FUNCTION aacgmmlong :PURPOSE: A wrapper procedure to choose AACGM DLM or IDL-native routines to convert a AACGM MLT to AACGM longitude. Please be aware that this wrapper works with AACGM DLM of ver. 4.0 or older, in which AACGM_MLONG() uses year and second of year (+ mlt) as arguments. The wrapper procedures/functions check !sdarn.aacgm_dlm_exists (if not defined, then define it by sd_init) to select appropriate AACGM routines (DLM, or IDL native ones attached to TDAS). :AUTHOR: Tomo Hori (E-mail: horit@stelab.nagoya-u.ac.jp) :Params: yr: 4-digit year for which MLT is calculated. t0: Second of year for which MLT is calculated. mlt: AACGM MLT to be converted to AACGM longitude. :Examples: mlon = aacgmmlong( yr, t0, mlt ) :HISTORY: 2011/10/04: created and got through the initial bug fixes $LastChangedBy: crussell $ $LastChangedDate: 2013-03-21 10:10:35 -0700 (Thu, 21 Mar 2013) $ $LastChangedRevision: 11857 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/erg/ground/radar/superdarn/sdaacgmlib/aacgmmlong.pro $