EXT530

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Name

Package EXT530 - set of external magnetic models

Description

Mead & Fairfield [1975], subroutine MEAD;

Tsyganenko short [1987], subroutine TSY87S;

Tsyganenko long [1987], subroutine TSY87L;

Tsyganenko [1989] (T89c), subroutine T89C;

Olson & Pfitzer quiet [1977], subroutine BXYZMU;

Olson & Pfitzer dynamic [1988], subroutine BDYN;

Tsyganenko [1996], subroutine T96_01.

Ostapenko & Maltsev [1997], subroutine BOM97.

The Mead & Fairfield [1975] model was obtained by a least-square-fit to 12616 vector field measurements from 451 orbits of four IMP satellites between 1966 and 1972. The model depends on four levels of magnetic activity parameterized by K_p. The model was developed by

D.H. Fairfield
NASA/GSFC, Code 695 Greenbelt
Maryland 20771, USA

The Tsyganenko magnetic field models are based on a large number of satellite observations (IMP, HEOS) covering the period 1966 to 1980. The models are obtained from 36682 data points for several levels of magnetic disturbance parameterized by K_p. The Tsyganenko [1987] model is provided as a 'long' and a 'short' versions. The Tsyganenko [1989] model T89c is tilt dependent and was primarily developed as a tail model. The Tsyganenko [1996] model has an explicitly defined realistic magnetopause, large-scale Region 1 and 2 Birkeland current systems, and the IMF penetration across the boundary. The models may be retrieved from NSSDC's anonymous FTP site and were developed by

N.A. Tsyganenko (ys2nt@lepvax.gsfc.nasa.gov)
NASA/GSFC, Code 695 Greenbelt
Maryland 20771, USA

The Olson & Pfitzer [1977] is an average models fit to quiet conditions using data from OGO 3, 5 and Explorer 33, 35. There are no parameters for this model. The dynamic model is a scalable model dependending upon the activity level but without a tilt dependence. The scale factor are determined by the activity index D_st and the standoff distance of the magnetopause obtained by the solar wind density and velocity. These models were developed by

K.A. Pfitzer and W.P. Olson
McDonnell Douglas Company, Code A3-208, Mail Stop 13/3
5301 Bolsa Avenue, Huntington Beach
California 92647, USA

The Ostapenko & Maltsev [1997] model was obtained by a least-square-fit of fourth-order polynomials to 14000 vector field measurements from the database of Fairfield et al. [1994]. The model depends on the D_st and K_p indices, as well as on the solar wind dynamic pressure and the z component of the interplanetary magnetic field. The model can be retrieved from

Y.P. Maltsev (maltsev@pgi-ksc.murmansk.su)
Polar Geophysical Institute
Apatity, RUSSIA

In the UNILIB libray, the codes of the implemented models have been modified in order to make them clearer and to correct small mistakes. These modifications have been made by

D. Heynderickx (daniel.heynderickx@bira-iasb.oma.be)
BIRA, Ringlaan 3
B-1180 Brussel, Belgium

References

Mead, G.D., and Fairfield, D.H., A quantitative magnetospheric model derived from spacecraft magnetometer data, JGR 80 (1975) 523-534
Olson, W.P., A model of the distributed magnetospheric currents, JGR 79 (1974) 3731-3738
Olson, W.P. and Pfitzer, K.A., Magnetospheric magnetic field modeling, Annual Scientific Report, AFOSR Contract No. F44620-75-C-0033 (1977)
Ostapenko, A.A., and Maltsev, Y.P., Relation of the magnetic field in the magnetosphere to the geomagnetic and solar wind activity, JGR 102 (1997) 17467-17473
Pfitzer, K.A., Olson, W.P., and Mogstad, T., A time dependent source driven magnetospheric magnetic field model, EOS 69 (1988) 426
Tsyganenko, N.A., Global quantitative models of the geomagnetic field in the cislunar magnetosphere for different disturbance levels, Planet. Space Sci. 35 (1987) 1347-1358
Tsyganenko, N.A., A magnetospheric magnetic field model with a wrapped tail current sheet, Planet. Space Sci. 37 (1989) 5-20
Tsyganenko, N.A. and Stern, D.P., Modeling the global magnetic field the large-scale Birkeland current systems, J.Geophys.Res. 101 (1996) 27187-27198

History

R.02

T96_01

BOM97

Synopsis

 
      REAL*8         xx, yy, zz, tilt, abx, aby, abz
      INTEGER*4      kp

      CALL MEAD (xx, yy, zz, tilt, kp, abx, aby, abz)


      REAL*8         x, y, z, ps, bx, by, bz
      INTEGER*4      iopt

      CALL TSY87S (iopt, ps, x, y, z, bx, by, bz)


      REAL*8         x, y, z, ps, bx, by, bz
      INTEGER*4      iopt

      CALL TSY87L (iopt, ps, x, y, z, bx, by, bz)


      REAL*8         parmod(10), ps, x, y, z, bx, by, bz
      INTEGER*4      iopt

      CALL T89C (iopt, parmod, ps, x, y, z, bx, by, bz)


      REAL*8         x, y, z, tilt, abx, aby, abz

      CALL BXYZMU (x, y , z, tilt, abx, aby, abz)


      REAL*8         x, y, z, tilt, abx, aby, abz
      REAL*8         den, vel, dst

      CALL BDYN (den, vel, dst, x, y, z, abx, aby, abz)


      REAL*8         parmod(10), ps, x, y, z, bx, by, bz
      INTEGER*4      iopt

      CALL T96_01 (iopt, parmod, ps, x, y, z, bx, by, bz)


      REAL*8         dst, pdyn, fkp, bimfz, r(3), b(3), sn

      CALL SET_A (dst, pdyn, fkp, bimfz, sn)
      CALL BOM97 (r, b)

Dependencies

BDYN

Subroutines
BDYNAM	BFMAGP	BFRING
BFTAIL
Functions
RINGST	STDOFF

The subroutine T89C makes use of the subroutine that is listed in the table below

Subroutine
T89

The subroutine T96_01 makes use of the subroutines, common blocks and functions that are listed in the table below

Subroutines
BCONIC	BIRK1SHLD	BIRK2SHL
BIRK1TOT_02	BIRK2TOT_02	CIRCLE
CONDIP1	CROSSLP	CYLHAR1
CYLHARM	DIPDISTR	DIPLOOP1
DIPOLE	DIPSHLD	DIPXYZ
INTERCON	LOOPS4	R2_BIRK
R2INNER	R2OUTER	R2SHEET
RINGCURR96	SHLCAR3X3	TAIL87
TAILDISK	TAILRC96
Functions
BES	BES0	BES1
FEXP	FEXP1	TKSI
XKSI
Common Blocks
COORD11	COORD21	DX1
LOOPDIP1	RHDR	WARP

The subroutine bom97 makes use of the common block and subroutines that are listed in the table below

common block
COEFOM97
subroutines
BAZ_T	JETASY	JETSYM
LEGNDR	PTNCL	SET_A