CCMC Metadata Registry (CMR)

fmtout

maximum number of time steps
- for a normal run (e.g., 48 hrs), this is a large integer, e.g., maxstep = 10000000
- for testing/debugging it can be set to a smaller number, e.g., maxstep = 10

runtime (hrs)
- maximum runtime is hrmax = 168 (7 days)
- nominal minimum runtime is hrmax = 36
(it takes ∼ 12 hrs for the ionosphere to develop)

output cadence (hrs)
- nominal output cadence is dthr = 0.25 (15 min)
- for testing/debugging it can be reduced to output data more often

time data starts to be output
- nominally hrpr = 0 and data is output from beginning of the run
- alternatively, if hrmax = 48 and hrpr = 24, data is output starting after the first day
(this reduces the size of the output files)

maximum time step (sec)
- should be in the range 2 - 8 sec
- the larger dt0, the faster the code runs in general
- however, depending on geophysical conditions and the grid, the code can give un- physical
results if initially too large (e.g., dt0 = 8)

grad_in

glat_in

glon_in

False for Sinusoidal Model and True for Fejer/ Scherliess Empirical Model

used to specify grid along the magnetic field
- best to leave rmin = 90

rmax

used to specify grid along the magnetic field
- best to leave altmin = 85 km

F10.7A
- 81 day average of F10.7

F10.7
- solar radio flux at 10.7 cm
- used as a measure of solar activity

Ap index
- The Ap index is a daily measure of magnetic activity

Year of the event

Day-of-the-year (DOY) of the event

mass number used in nrlmsise00
- mmass = 48 (do not change)

first ion specie
- nion1 = 1 (H+) (do not change)

last ion specie
- nion1 = 7 (N+) (do not change)

starting time (UT hrs)
- nominal value hrinit = 0 (i.e., midnight GMT) - best not to change

modifies the magnitude of the neutral wind speed
- nominally tvn0 = 1
- use caution when changing, e.g., tvn0 = 2 will double the neutral wind speed

modifies the magnitude of the E × B velocity
- nominally tvexb0 = 1
- use caution when changing, e.g., tvexb0 = 0 will set the E × B drift to 0

Max ExB

not used (leave 0)

adjusts grid spacing along the magnetic field line
- best to leave gams = .1

adjusts grid spacing in latitude
- best to leave gams = 2.5

multiplier for neutral densities
- the 7 entries correspond to the 7 neutral species in ‘parameter mod.f90’
- for example, if snn = 1.,2.,1.,1.,1.,1.,1., then the oxygen neutral density is doubled

multiplier for the neutral temperature
- this will change the ion temperatures because of ion-neutral coupling - it will not change the scale height of the neutrals

minimum ion density allowed (cm−3)
- best to leave denmin = 1.e-6

alt_crit

cqe