From fesen@tides.dartmouth.edu Thu Mar 7 10:35 MST 1996 Received: from cedar.hao.ucar.edu (cedar [128.117.16.90]) by vishnu.hao.ucar.edu (8.7.3/8.7.3) with ESMTP id KAA07838 for ; Thu, 7 Mar 1996 10:35:44 -0700 (MST) Received: from dartvax.dartmouth.edu (dartvax.dartmouth.edu [129.170.16.4]) by cedar.hao.ucar.edu (8.7.3/8.7.3) with ESMTP id KAA09074 for ; Thu, 7 Mar 1996 10:35:40 -0700 (MST) Received: from tides.Dartmouth.EDU (tides.dartmouth.edu [129.170.26.63]) by dartvax.dartmouth.edu (8.7.5.1+DND/8.7.3) with SMTP id MAA04639 for ; Thu, 7 Mar 1996 12:35:36 -0500 (EST) Received: by tides.Dartmouth.EDU (4.1/SMI-4.1) id AA00890; Thu, 7 Mar 96 12:41:45 EST Date: Thu, 7 Mar 96 12:41:45 EST From: fesen@tides.dartmouth.edu (Cassandra Fesen) Message-Id: <9603071741.AA00890@tides.Dartmouth.EDU> To: foster@cedar.hao.ucar.edu Content-Type: text Content-Length: 1452 Status: RO Hi Ben -- a question (I think I asked this before, maybe more than once, but it's one of those things that always can cause confusion:) I am using an older version of the model post-processor, tigcmloc, and used ionvel=2 to get out drifts and also ve and vu. I get back things labeled: TIEGCM magnetic zonal ion drift (exb + unvn) TIEGCM magnetic meridional ion drift (exb + unvn) TIEGCM magnetic vertical ion drift (exb + unvn) VE (m/s perpendicular to mag field, +east) VU (m/s perpendicular to mag field, +up) the question is re the magnetic (zonal, meridional, vertical) drifts: are these the drifts in the geographic coordinates? So the results represent the drifts at the model gridpoints which are in the geographic east, geographic north, and geographic (radial) up direction? For the horizontal components, these would have had a projection of ExB drift onto the horizontal plane taken into account, and added to this would be the neutral wind contributions in the appropriate directions. Part of what's confusing me is the label "magnetic" on the first 3 quantities listed ("TIEGCM magnetic zonal..., TIEGCM magnetic meridional ..., etc.) The VE and VU: like it says, these are essentially the ExB drifts part, referenced to the geomagnetic field line, so VU is the drift perpendicular to the field line in the upward direction and VE in the eastward direction. Anyhow, thanks for going through this again with me, Cassandra