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WACCMX-MAGE 2-way coupling #1649

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da08441
merged in branch waccmx_kevin
fvitt Jul 26, 2026
ea277a5
Merge remote-tracking branch 'ESCOMP/cam_development' into waccmx_mag…
fvitt Aug 14, 2026
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6 changes: 6 additions & 0 deletions bld/namelist_files/namelist_definition.xml
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Expand Up @@ -5625,6 +5625,12 @@ Give the user the ability to input LTR high-latitude electric potential.
Default: FALSE
</entry>

<entry id="ionos_epotential_mage" type="logical" category="waccmx"
group="ionosphere_nl" valid_values="">
For 2-way coupling WACCM-X with MAGE magnetosphere

@cacraigucar cacraigucar Aug 18, 2026

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Is MAGE a welknown acronym, or should the namelist description give a little more information?

Default: FALSE
</entry>

<entry id="ltr_files" type="char*256(20)" input_pathname="abs" category="waccmx"
group="ionosphere_nl" valid_values="" >
List of full pathnames of LTR electic potential inputs for both hemispheres.
Expand Down
18 changes: 15 additions & 3 deletions src/ionosphere/waccmx/dpie_coupling.F90
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Expand Up @@ -13,6 +13,7 @@ module dpie_coupling
use perf_mod, only: t_startf, t_stopf
use amie_module, only: getamie
use ltr_module, only: getltr
use mage_module, only: mage_advance
use edyn_solve, only: phihm
use edyn_params, only: dtr, rtd
use aurora_params, only: prescribed_period ! turns on overwrite of energy fields in aurora phys
Expand Down Expand Up @@ -119,7 +120,7 @@ subroutine d_pie_init( edyn_active_in, oplus_xport_in, oplus_nsplit_in, crit_col
end subroutine d_pie_init

!-----------------------------------------------------------------------
subroutine d_pie_epotent( highlat_potential_model, crit_out, cols, cole, efx_phys, kev_phys, amie_in, ltr_in )
subroutine d_pie_epotent( highlat_potential_model, crit_out, cols, cole, efx_phys, kev_phys, amie_in, ltr_in, mage_in )
use edyn_solve, only: pfrac ! NH fraction of potential (nmlonp1,nmlat0)
use time_manager, only: get_curr_date
use heelis, only: heelis_model
Expand All @@ -142,6 +143,7 @@ subroutine d_pie_epotent( highlat_potential_model, crit_out, cols, cole, efx_phy
integer, optional, intent(in) :: cols, cole
logical, optional,intent(in) :: amie_in
logical, optional,intent(in) :: ltr_in
logical, optional,intent(in) :: mage_in

! Prescribed energy flux
real(r8), optional, intent(out) :: efx_phys(:)
Expand All @@ -151,7 +153,7 @@ subroutine d_pie_epotent( highlat_potential_model, crit_out, cols, cole, efx_phy
!
! local vars
!
logical :: amie_inputs, ltr_inputs
logical :: amie_inputs, ltr_inputs, mage_inputs

real(r8) :: secs ! time of day in seconds
integer :: iyear,imo,iday,tod ! tod is time-of-day in seconds
Expand Down Expand Up @@ -202,10 +204,12 @@ subroutine d_pie_epotent( highlat_potential_model, crit_out, cols, cole, efx_phy

amie_inputs=.false.
ltr_inputs=.false.
mage_inputs=.false.
if (present(amie_in)) amie_inputs=amie_in
if (present(ltr_in)) ltr_inputs= ltr_in
if (present(ltr_in)) mage_inputs= mage_in

@cacraigucar cacraigucar Aug 18, 2026

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Should this be if (present(mage_in))?


prescribed_inputs: if (amie_inputs .or. ltr_inputs) then
prescribed_inputs: if (amie_inputs .or. ltr_inputs .or. mage_inputs) then

if (.not. (present(kev_phys).and.present(efx_phys)) ) then
call endrun('d_pie_epotent: kev_phys and efx_phys must be present')
Expand All @@ -224,6 +228,14 @@ subroutine d_pie_epotent( highlat_potential_model, crit_out, cols, cole, efx_phy
write(iulog,"('After Calling getamie >>> iamie = ', i2)") iamie
end if
prescribed_period = iamie == 1
else if (mage_inputs) then

@cacraigucar cacraigucar Aug 18, 2026

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This logic indicates that only one of amie_inputs or mage_inputs is used. Should there be a check during namelist setting to exit with an error if both are set to true?

if (masterproc) then
write(iulog,*) 'Calling mage_advance >>> '
end if

call mage_advance( iyear, imo, iday, tod, &
prescr_phihm, prescr_efxm, prescr_kevm )
prescribed_period = .TRUE.
else
if (masterproc) then
write(iulog,*) 'Calling getltr >>> '
Expand Down
18 changes: 16 additions & 2 deletions src/ionosphere/waccmx/edynamo.F90
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Expand Up @@ -32,8 +32,10 @@ module edynamo
real(r8), allocatable, dimension(:,:) :: &
zigm11, & ! sigma11*cos(theta0)
zigmc, & ! sigmac
zigm1, & ! for Hall conductance diagnostic
zigm1, & ! for Hall conductance diagnostic (folded)
azigm1, & ! for Hall conductance diagnostic (not folded)
zigm2, & ! sigma2
azigm2, & ! for Ped conductance diagnostic (not folded)
zigm22, & ! sigma22/cos(theta0)
rim1,rim2, & ! see description in comment below
rhs, & ! right-hand side of PDE
Expand Down Expand Up @@ -105,7 +107,7 @@ module edynamo
logical, public :: debug_hist = .false.

public :: alloc_edyn, ed1, ed2, ed1_glb, ed2_glb
public :: zigm11, zigmc, zigm2, zigm22, rim1, rim2
public :: zigm11, zigmc, zigm2, zigm22, rim1, rim2, azigm1, azigm2
public :: dynamo

contains
Expand Down Expand Up @@ -368,9 +370,15 @@ subroutine alloc_edyn
allocate(zigm1(mlon00:mlon11,mlat00:mlat11) ,stat=istat)
if (istat /= 0) call endrun('alloc_edyn: zigm1')
zigm1 = finit
allocate(azigm1(mlon00:mlon11,mlat00:mlat11) ,stat=istat)
if (istat /= 0) call endrun('alloc_edyn: azigm1')
azigm1 = finit
allocate(zigm2(mlon00:mlon11,mlat00:mlat11) ,stat=istat)
if (istat /= 0) call endrun('alloc_edyn: zigm2')
zigm2 = finit
allocate(azigm2(mlon00:mlon11,mlat00:mlat11) ,stat=istat)
if (istat /= 0) call endrun('alloc_edyn: azigm2')
azigm2 = finit
allocate(zigm22(mlon00:mlon11,mlat00:mlat11),stat=istat)
if (istat /= 0) call endrun('alloc_edyn: zigm22')
zigm22 = finit
Expand Down Expand Up @@ -528,7 +536,9 @@ subroutine fieldline_integrals( ped_mag, hal_mag, adotv1_mag, adotv2_mag, &
zigm11 = finit
zigm22 = finit
zigm1 = finit
azigm1 = finit
zigm2 = finit
azigm2 = finit
zigmc = finit
rim1 = finit
rim2 = finit
Expand Down Expand Up @@ -929,6 +939,10 @@ subroutine complete_integrals
fmsub(:,:,6) = rim2 (mlon0:mlon1,mlat0:mlat1)
fmsub(:,:,7) = zigm1 (mlon0:mlon1,mlat0:mlat1)

! Store zigm1 for coupling before folding hemispheres
azigm1(mlon0:mlon1,mlat0:mlat1) = zigm1(mlon0:mlon1,mlat0:mlat1)
azigm2(mlon0:mlon1,mlat0:mlat1) = zigm2(mlon0:mlon1,mlat0:mlat1)

call mp_mag_foldhem(fmsub,mlon0,mlon1,mlat0,mlat1,nf2d)
call mp_mag_periodic_f2d(fmsub,mlon0,mlon1,mlat0,mlat1,nf2d)

Expand Down
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