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ULTRA l1c update earth culling radius #2515

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Merged
lacoak21 merged 2 commits into from
Dec 17, 2025
Merged

ULTRA l1c update earth culling radius #2515

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fabff83
update keepout radius
lacoak21 Dec 16, 2025
521fb9b
bug fix
lacoak21 Dec 17, 2025
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4 changes: 4 additions & 0 deletions imap_processing/ultra/constants.py
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Original file line number Diff line number Diff line change
Expand Up @@ -160,3 +160,7 @@ class UltraConstants:
# For FOV calculations
FOV_THETA_OFFSET_DEG = 0.0
FOV_PHI_LIMIT_DEG = 60.0

# For spatiotemporal culling
EARTH_RADIUS_KM: float = 6378.1
DEFAULT_EARTH_CULLING_RADIUS = EARTH_RADIUS_KM * 30
9 changes: 6 additions & 3 deletions imap_processing/ultra/l1c/helio_pset.py
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Expand Up @@ -13,6 +13,7 @@
met_to_ttj2000ns,
ttj2000ns_to_et,
)
from imap_processing.ultra.constants import UltraConstants
from imap_processing.ultra.l1b.ultra_l1b_culling import get_de_rejection_mask
from imap_processing.ultra.l1c.l1c_lookup_utils import (
build_energy_bins,
Expand Down Expand Up @@ -203,7 +204,7 @@ def calculate_helio_pset(
# Compute mask for culling the Earth
compute_culling_mask(
time_bins,
6378.1, # Earth radius
UltraConstants.DEFAULT_EARTH_CULLING_RADIUS,
helio_pset_quality_flags,
nside=nside,
)
Expand All @@ -229,8 +230,10 @@ def calculate_helio_pset(
pset_dict["spin_phase_step"] = np.arange(len(deadtime_ratios))
pset_dict["quality_flags"] = helio_pset_quality_flags[np.newaxis, ...]

pset_dict["scatter_theta"] = scattering_theta
pset_dict["scatter_phi"] = scattering_phi
# Convert FWHM to gaussian uncertainty by dividing by 2.355
# See algorithm documentation (section 3.5.7, third bullet point) for more details
pset_dict["scatter_theta"] = scattering_theta / 2.355
pset_dict["scatter_phi"] = scattering_phi / 2.355
pset_dict["scatter_threshold"] = scattering_thresholds

# Add the energy delta plus/minus to the dataset
Expand Down
3 changes: 2 additions & 1 deletion imap_processing/ultra/l1c/spacecraft_pset.py
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Expand Up @@ -13,6 +13,7 @@
met_to_ttj2000ns,
ttj2000ns_to_et,
)
from imap_processing.ultra.constants import UltraConstants
from imap_processing.ultra.l1b.ultra_l1b_culling import get_de_rejection_mask
from imap_processing.ultra.l1c.l1c_lookup_utils import (
build_energy_bins,
Expand Down Expand Up @@ -190,7 +191,7 @@ def calculate_spacecraft_pset(
# Compute mask for culling the Earth
compute_culling_mask(
time_bins,
6378.1, # Earth radius
UltraConstants.DEFAULT_EARTH_CULLING_RADIUS,
spacecraft_pset_quality_flags,
nside=nside,
)
Expand Down