PROCEDURE: MVN_SWIA_PENPROT_DIR PURPOSE: Routine to determine density and velocity of penetrating protons at periapsis Uses directional spectra to better filter out penetrating proton population AUTHOR: Jasper Halekas CALLING SEQUENCE: MVN_SWIA_PENPROT_DIR, REG = REG, NPO = NPO, /ARCHIVE INPUTS: KEYWORDS: REG: region structure from 'mvn_swia_regid' NPO: number of determinations per orbit ARCHIVE: use archive data $LastChangedBy: jhalekas $ $LastChangedDate: 2014-12-08 13:10:18 -0800 (Mon, 08 Dec 2014) $ $LastChangedRevision: 16405 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/maven/swia/mvn_swia_penprot_dir.pro $