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
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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
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Outputs
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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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