HorizontalWind:

Path: ACPro/Wind

% Horizontal wind model HWM93 covering all altitude regions

   MSIS-86 density model and GWS4 for thermospheric winds.
   UT, Local Time, and Longitude are used independently in the
   model and are not of equal importance for every situation.  
   For the most physically realistic calculation these three
   variables should be consistent.

   Since version 3.5 (ACT).
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   Form:
   [W, WBT, WCT] = HorizontalWind( IYD, SEC, ALT, GLAT, GLONG, STL, F107A,
                                   F107, AP, SW )

   Additional comments:

   To turn on or off particular variations pass SW as the last
   argument where SW is a 25 element array with

   0 for off
   1 for on 
   2 or main effects off but cross terms on

   The variations:

   1  - F10.7 EFFECT ON MEAN
   2  - TIME INDEPENDENT
   3  - SYMMETRICAL ANNUAL
   4  - SYMMETRICAL SEMIANNUAL
   5  - ASYMMETRICAL ANNUAL
   6  - ASYMMETRICAL SEMIANNUAL
   7  - DIURNAL
   8  - SEMIDIURNAL
   9  - DAILY AP
   10 - ALL UT/LONG EFFECTS
   11 - LONGITUDINAL
   12 - UT AND MIXED UT/LONG
   13 - MIXED AP/UT/LONG
   14 - TERDIURNAL
   16 - ALL WINDF VAR
   17 - ALL WZL VAR
   18 - ALL UN1 VAR
   19 - ALL WDZL VAR
   24 - ALL B FIELDS (DIV)
   25 - ALL C FIELDS (CURL)

   For example, to get zonal averages (no diurnal or
   longitudinal variations) set SW(7), SW(8), SW(14),
   and SW(10) equal to 0.  To just remove tidal variations 
   set SW(7), SW(8), and SW(14) equal to 0.

   If no arguments are entered it will run a demo.
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   ------
   Inputs
   ------
   IYD   (1,1) YEAR AND DAY AS YYYYDDD
   SEC   (1,1) UT(SEC)  (Not important in lower atmosphere)
   ALT   (1,1) ALTITUDE(KM) 
   GLAT  (1,1) GEODETIC LATITUDE(DEG)
   GLONG (1,1) GEODETIC LONGITUDE(DEG)
   STL   (1,1) LOCAL APPARENT SOLAR TIME(HRS)
   F107A (1,1) 3 MONTH AVERAGE OF F10.7 FLUX (Use 150 in lower atmos.)
   F107  (1,1) DAILY F10.7 FLUX FOR PREVIOUS DAY ( " )
   AP    (1,2) [MAGNETIC INDEX(DAILY) (use 4 in lower atmos.),
                CURRENT 3HR ap INDEX (used only when SW(9)=-1.)]
   SW    (1,25) Switches

   -------
   Outputs
   -------
   W     (1,2) [MERIDIONAL (m/sec + Northward) ZONAL (m/sec + Eastward)]
   WBT   (1,2) 
   WCT   (1,2)

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    Reference: A. E. HEDIN  (1/25/93) (4/9/93)
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    Copyright (c) 2003 Princeton Satellite Systems, Inc.
    All Rights Reserved.
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