Open Access
Table 2
List of variables.
| Symbol | Variant | Unit | Description |
|---|---|---|---|
| Coordinate systems (with origin at the center of the comet nucleus) | |||
| (r, θ, ϕ) | (m, °, °) | Spherical coordinates (radius, azimuth, colatitude) | |
| (ρ, θ, z) | (m, °, m) | Cylindrical coordinates | |
| (X, Y, Z) | (km, km, km) | Cartesian coordinates as defined in Koschny et al. (2007) | |
| rh | (AU) | Heliocentric distance | |
| Δ | (km) | Distance of Rosetta to the comet | |
| r | (m or km) | Distance to the center of the nucleus | |
| ρ | (m or km) | Distance to the center of the nucleus in the X, Y mapping plane | |
| T, Trot | T(r), Trot(ρ) | (K) | Gas temperature, rotational temperature; as a function of r or ρ |
| vexp | vexp(r) | (km s−1) | Mean gas expansion velocity; depending on radial distance r |
| v | vi | (km s−1) | Doppler velocity relative to the nucleus; of a spectral channel i |
| Δv | (km s−1) | Mean Doppler shift of a whole line ∫ (Tmb(v)vdv)∕∫ (Tmb(v)dv) | |
| α(a) | (° or radian) | Angle between the jet axis and considered direction | |
| PA (a) | PAjet, PApole | (°) | Position angle counted from the +Y axis in the (X,Y) map plane |
| ϕ(a) | ϕJ, ϕi, ϕpole | (°) | Colatitude or polar angle, counted from the -Z axis |
| θJ (a) |  |
(°) | FWHM of the (Gaussian) jet |
| θproj | (°) | FWHM of the jet in the X, Y plane | |
| θϕ | (°) | FWHM of the jet in colatitude: (jet, Z) plane) | |
| θaz | (°) | FWHM of the jet in the plane perpendicular to (jet, Z) (θaz < θproj) | |
| A | A(PA, ρ) | (mK km s−1) | Line area (integrated intensity); at a given point (PA, ρ) of a map |
| A0, Ap | (mK km s−1) | Line area values for a fit: background (A0) and Peak value (Ap) | |
| AI, AJ | (mK km s−1) | Line area values for a fit: isotropic and jet contribution | |
 ,Tmb |
(K) | Line intensity scale: antenna or main beam temperature | |
| ηB | – | Main beam efficiency:  |
|
| Tp | Tem, Tabs | (K) | Peak intensity of a line (Rayleigh–Jeans equivalent temperature) |
| Tp(v), Tp(ρ) | (K) | Peak intensity of a line for a given velocity channel, at a given projected distance | |
| Tbg | (K) | Background nucleus (or dust) (Rayleigh–Jeans) temperature (continuum) | |
| Ωjet | (sr) | Jet solid angle =  |
|
| q | q(α) | (molec. s−1sr−1) | Production rate per solid angle; as a function of angle α |
| qi (ϕ), qnadir | (molec. s−1sr−1) | Production rate per solid angle as a function of ϕ (derived from channel i) or nadir value (ϕ = 0) | |
| qI | qI,ϕ, qI, az | (molec. s−1sr−1) | Production rate per solid angle for isotropic contribution; derived along the ϕ angle or perpendicularly (az) |
| qJ | qJ,ϕ, qJ,az | (molec. s−1sr−1) | Production rate per solid angle in the jet: peak value; derived along the ϕ angle or perpendicularly (az) |
| Q, Qtotal | Q(ρ), Q(r) | (molec. s−1) | Total production rate (for a given molecule); locally as a function of ρ or r |
| Q(rh) | (molec. s−1) | Heliocentric variation in total production rate of a given molecule | |
| QI, QJ | (molec. s−1) | Production rate in the isotropic, jet component: Q = QI + QJ | |
Notes. (a) See Fig. 4.
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