photo_timescale¶

sbpy.activity.gas.core.photo_timescale(species=None, source=None)[source]¶

Photodissociation timescale for a gas species.

Parameters:

speciesstring, optional: Species to look up or None to show a list of all species and sources.
sourcestring, optional: Retrieve values from this source or None to show a list of all sources for given species.

Returns:

tauQuantity or None: The timescale at 1 au. May be a two-element array: (quiet Sun, active Sun). None is returned if species or source is None.

References

[CS93] Table IV of Cochran & Schleicher 1993, Icarus 105, 235-253. Quoted for intermediate solar activity.

[C94] Crovisier 1994, JGR 99, 3777-3781.

[CE83] Crovisier & Encrenaz 1983, A&A 126, 170-182.

[H92] Huebner et al. 1992, Astroph. & Space Sci. 195, 1-294.

[HM15] Huebner and Mukherjee 2015, Plan. & Space Sci. 106, 11-45.

Examples

>>> from sbpy.activity import photo_timescale
>>> tau = photo_timescale("OH", "CS93")