Table C.2
Bivariate (T, v) polynomial fits for Maxwellian-averaged charge-changing and ionization cross sections for (H+, H0, and H−) projectiles colliding with H2O vapor.
| Coefficients | Charge-changing cross sections H–H2O | Ionization cross sections H–H2O | ||||||
|---|---|---|---|---|---|---|---|---|
 |
 |
 |
 |
 |
 |
 |
 |
|
| Degree (n, m) | (4, 5) | (4, 4) | (4, 4) | (4, 5) | (4, 4) | (4, 5) | (4, 4) | (4, 4) |
| T(× 106 K) | 0.025− 10 | 0.025− 1.6 | 0.025− 10 | 0.025−1.6 | 0.025−10 | 0.025−10 | 0.025−10 | 0.025−10 |
| p00 | 6.151E+01 | −3.085E-02 | −2.149E+00 | 1.899E+00 | 1.679E+00 | 5.445E+02 | −9.696E-01 | −1.212E+01 |
| p10 | 3.886E-04 | 2.826E-08 | 5.952E-06 | 2.109E-05 | 6.312E-06 | 1.003E-04 | 3.118E-06 | 3.543E-05 |
| p01 | 2.331E-02 | 5.110E-07 | −1.595E-05 | 5.904E-05 | 2.749E-05 | 1.249E-03 | −6.480E-06 | 7.489E-05 |
| p20 | −5.076E-11 | 3.080E-14 | 7.320E-14 | −4.450E-12 | −7.040E-13 | −2.007E-11 | 2.893E-13 | −3.656E-12 |
| p11 | −3.137E-09 | 1.077E-13 | 3.381E-12 | −4.133E-11 | −6.877E-12 | −4.151E-10 | 3.639E-12 | −2.506E-11 |
| p02 | −9.085E-08 | −3.405E-12 | 2.546E-10 | 5.611E-10 | 1.342E-10 | −1.057E-09 | 9.705E-11 | 1.133E-09 |
| p30 | 4.472E-18 | −3.201E-21 | −4.963E-21 | 4.808E-19 | 6.839E-20 | 1.948E-18 | −2.719E-20 | 3.602E-19 |
| p21 | 2.028E-16 | −1.941E-20 | −1.956E-19 | 1.057E-17 | 6.270E-19 | 6.146E-17 | −3.573E-19 | 2.821E-18 |
| p12 | 8.870E-15 | 8.670E-19 | −9.357E-19 | −3.972E-17 | 1.168E-18 | 4.984E-16 | 6.289E-18 | −3.051E-17 |
| p03 | 1.455E-13 | 1.389E-17 | −2.668E-17 | −1.115E-15 | −1.373E-16 | −2.555E-15 | 1.024E-16 | −1.098E-15 |
| p40 | −1.530E-25 | 1.186E-28 | 1.190E-28 | −1.797E-26 | −2.416E-27 | −6.820E-26 | 9.413E-28 | −1.268E-26 |
| p31 | −1.172E-23 | 9.531E-28 | 7.201E-27 | −1.087E-24 | −2.645E-26 | −4.878E-24 | 1.426E-26 | −1.379E-25 |
| p22 | −2.677E-22 | 1.022E-27 | 7.523E-26 | −1.775E-24 | −1.521E-25 | −4.111E-23 | 1.166E-25 | −2.291E-25 |
| p13 | −1.050E-20 | −9.332E-25 | −6.307E-24 | 8.836E-23 | 4.486E-25 | −2.427E-22 | −9.814E-24 | 2.507E-23 |
| p04 | −1.030E-19 | −4.447E-24 | −1.437E-23 | 7.177E-22 | 5.356E-23 | 4.788E-21 | −3.734E-23 | 3.310E-22 |
| p41 | 2.810E-31 | − | − | 3.524E-32 | − | 1.357E-31 | − | − |
| p32 | 6.353E-30 | − | − | 2.508E-31 | − | 1.766E-30 | − | − |
| p23 | 1.181E-28 | − | − | −2.311E-30 | − | 5.386E-30 | − | − |
| p14 | 4.464E-27 | − | − | −3.188E-29 | − | 4.929E-29 | − | − |
| p05 | 2.572E-26 | − | − | −1.419E-28 | − | −2.276E-27 | − | − |
Notes. The fits are valid for solar wind speeds 100− 800 km s−1 and for solar wind temperatures ranging from 25 000 K to 10 × 106 K, unless mentioned otherwise. “E±XX” refers to × 10±XX. Bivariate polynomial fits are given in the Notes of Table C.1. Errors are a combination of those of the non-averaged cross sections and that of the bivariate fits. They are indicated in superscript as (a) < 25%, (b) 25− 75%, (c) > 75%.
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