Closed abukowski21 closed 4 years ago
The second parameter of jb2008
is the latitude and the third is the longitude. You can see the documentation by typing: ?jb2008
:
help?> jb2008
search: jb2008 JB2008_Output
function jb2008(JD::Number, glat::Number, glon::Number, h::Number)
function jb2008(JD::Number, glat::Number, glon::Number, h::Number, F10::Number, F10ₐ::Number, S10::Number, S10ₐ::Number, M10::Number, M10ₐ::Number, Y10::Number, Y10ₐ::Number, DstΔTc::Number)
Compute the atmospheric density using the Jacchia-Bowman 2008 (JB2008) model.
If the space indices are not provided (first call), then they will be obtained from the online database. In this case,
the function init_space_indices() must be called first and the function will throw an exception if the selected JD is
outside of the available data.
This model is a product of the Space Environment Technologies, more information can be seen in the websites:
http://sol.spacenvironment.net/jb2006/
http://sol.spacenvironment.net/jb2008/
Args
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• JD: Julian day.
• glat: Geocentric latitude [rad].
• glon: Geocentric longitude [rad].
• h: Altitude [m].
• F10: 10.7-cm solar flux [10⁻²² W/(M² Hz)] (Tabular time 1 day earlier).
• F10ₐ: 10.7-cm averaged solar flux, 81-day centered on input time (Tabular time 1 day earlier).
• S10: EUV index (26-34 nm) scaled to F10.7 (Tabular time 1 day earlier).
• S10ₐ: EUV 81-day averaged centered index (Tabular time 1 day earlier).
• M10: MG2 index scaled to F10.7 (Tabular time 2 days earlier).
• M10ₐ: MG2 81-day averaged centered index (Tabular time 2 days earlier).
• Y10: Solar X-ray & Lya index scaled to F10.7 (Tabular time 5 days earlier).
• Y10ₐ: Solar X-ray & Lya 81-day averaged centered index (Tabular time 5 days earlier).
• DstΔTc: Temperature variation related to the Dst.
Returns
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An instance of the structure JB2008_Output with the computed values.
Changing the parameters we have:
julia> jb2008(DatetoJD(2010, 5, 1, 0, 44, 18), deg2rad(83.40), deg2rad(355.94), 292000.00, 80.80,76.40,78.70,73.10,79.00,75.90,86.80,79.60,31.00)
JB2008_Output{Float64}
nN2: Float64 4.999327095536922e13
nO2: Float64 2.581844106708866e12
nO: Float64 3.982511703541514e14
nAr: Float64 8.795664543367258e9
nHe: Float64 6.52909052144658e12
nH: Float64 1.9751806978697314e11
rho: Float64 1.3086707143236572e-11
T_exo: Float64 784.9497202580523
Tz: Float64 770.6360757426783
Something strange is happening with complex variables in the JB2008 model. I tried changing all the erroneous exponentials to Complex(x)^y, but that didn't fix it. I'm trying to compare GOCE neutral density data to JB2008's predictions in May 2010. This error seems to happen for most of that month (~180,000/~242,000 times). I haven't seen any errors like this for several other runs.
jb2008(DatetoJD(2010, 5, 1, 0, 44, 18), deg2rad(355.94), deg2rad(83.40), 292000.00, 80.80,76.40,78.70,73.10,79.00,75.90,86.80,79.60,31.00)
Any ideas?