Hi Jonathan, Is it the convention to include the direction in the name? We will be calculating the gradient in more then one axis (Txy, Txz, etc, for a total of 6 quantities).
Kind regards, On Tue, 2014-12-16 at 17:52 +0000, Jonathan Gregory wrote: > Dear Napoleon > > Ah, I see. It is dg/dz. In that case I would call it > > upward_derivative_of_acceleration_due_to_gravity > > since Xward_derivative is a construction we use in other names. With this > name it would be a negative number (g decreases as you go upward). If you > want a positive number it would be downward_derivative_etc. It is good > to specify the direction of the derivative, because you might want to name > other ones. You might later want a name for dg/dx, for example. > > Best wishes > > Jonathan > > > > > Gravity Potential Gradient > > > > standard name: gravity_potential_gradient > > > > unit: s-2 > > > > > > There is an existing stdname of specific_gravitational_potential_energy > > > in J kg-1 = m2 s-2. Since taking a gradient has a sign and direction, your > > > quantity could be called > > > upward_derivative_of_specific_gravitational_potential_energy > > > for consistency with other names for derivatives, and it's in m s-2, > > > isn't it? > > > - not s-2. However this quantity could also, more familiarly, be called > > > the > > > acceleration_due_to_gravity i.e. g. Is it g you mean? I suppose g is the > > > vertical derivative of geopotential, which isn't quite the same as GPE. > > > Are > > > you making a distinction here? > > > > > > > With this quantity I have make a correction and say it is rather a second > > order > > derivative of the potential, more related to spatial rate of change of g. > > Like what is described here: > > http://www.gradiometry.com/gradiometry In some cases, the unit used is the > > eotvos, but we prefer s-2. > > Perhaps just gravity_gradient ? -- N.E. Cornejo, Msc. Engineering, Space & Science http://www.stcorp.nl s[&]t
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