neptoon.corrections.theory
pressure_corrections¶
Functions:
- calc_pressure_correction_factor
- calc_mean_pressure
- calc_atmos_depth_mean_press
- calc_beta_coefficient_desilets_zreda_2003
- calc_beta_coefficient_desilets_2021
- calc_beta_ceofficient_tirado_bueno_etal_2021
Functions related to neutron corrections for changes to atmospheric pressure.
Functions in this module:
pressure_correction_l_coeff
pressure_correction_beta_coeff
calc_mean_pressure
calc_beta_coefficient
calc_pressure_correction_factor ¶
Calculate a pressure correction factor accounting for changes in atmospheric pressure on neutron counting rates, using the beta coefficient method.
Parameters:
| Name | Type | Description | Default |
|---|---|---|---|
current_pressure
|
float
|
Current atmospheric pressure at the site in hectopascals (hPa). |
required |
reference_pressure
|
float
|
Reference atmospheric pressure, typically a long-term average at the site, in pascals (Pa) to keep correction factors around 1 |
required |
beta_coeff
|
float
|
Beta coefficient, akin to (1/l_coeff), and used as per Hawdon et al., 2014, typically around 0.007 |
required |
Returns:
| Type | Description |
|---|---|
c_factor
|
Correction factor to multiply raw neutron count rates by, e.g., 1.04. |
calc_mean_pressure ¶
Calculate mean atmospheric pressure based on elevation.
Parameters:
| Name | Type | Description | Default |
|---|---|---|---|
elevation
|
float
|
Elevation above sea level in meters (m). |
required |
Returns:
| Name | Type | Description |
|---|---|---|
mean_pressure |
float
|
Mean atmospheric pressure at the given elevation in millibars (mb). |
calc_beta_coefficient_desilets_zreda_2003 ¶
Calc beta coeff according to Desilets and Zreda (2003).
https://doi.org/10.1016/S0012-821X(02)01088-9
Returns:
| Type | Description |
|---|---|
_type_
|
description |
calc_beta_coefficient_desilets_2021 ¶
Calculate the beta coefficient necessary for the pressure_correction_beta_coeff() function. This coefficient represents the inverse of the mass attenuation length.
Parameters:
| Name | Type | Description | Default |
|---|---|---|---|
latitude
|
float
|
Geographic latitude of the site in degrees. |
required |
elevation
|
float
|
Elevation of the site in meters (m). |
required |
cutoff_rigidity
|
float
|
Cutoff rigidity at the site in MeV. |
required |
Returns:
| Name | Type | Description |
|---|---|---|
beta_coeff |
float
|
Beta coefficient at site (usually ~0.007) |
calc_beta_ceofficient_tirado_bueno_etal_2021 ¶
Calculated the beta coefficient according to Tirado-Bueno et al., (2021)
https://doi.org/10.1016/j.asr.2021.04.034
Parameters:
| Name | Type | Description | Default |
|---|---|---|---|
cutoff_rigidity
|
float
|
Cutoff rigidity in GV |
required |
Returns:
| Type | Description |
|---|---|
float
|
The cutoff rigidity at the site |