{"module": "starlink_doppler_tomography", "version": "1.0.0", "description": "Starlink Ka-band Doppler ionospheric tomography (SDIT)", "constellation": {"count": 11191, "sample_names": ["STARLINK-1008", "STARLINK-1012", "STARLINK-1017", "STARLINK-1020", "STARLINK-1039", "STARLINK-1042", "STARLINK-1043", "STARLINK-1046", "STARLINK-1047", "STARLINK-1048"], "fetched": true, "source": "celestrak"}, "feature_count": 15, "feature_names": ["sdit_n_starlinks_visible", "sdit_mean_doppler_shift_hz", "sdit_doppler_variance_hz2", "sdit_tec_tomographic_tecu", "sdit_tec_ionex_validation_tecu", "sdit_tec_residual_tecu", "sdit_electron_density_peak_m3", "sdit_ionospheric_gradient_tecu_deg", "sdit_scintillation_index_s4", "sdit_orbital_geometry_coverage", "sdit_f_layer_height_km", "sdit_kp_geomagnetic_index", "sdit_solar_zenith_angle_deg", "sdit_composite_tomography_score", "sdit_data_real"], "locations": {"equatorial": {"location": {"lat": 0.0, "lon": -80.0}, "features": {"sdit_n_starlinks_visible": 91.0, "sdit_mean_doppler_shift_hz": 0.0, "sdit_doppler_variance_hz2": 0.0, "sdit_tec_tomographic_tecu": 18.27, "sdit_tec_ionex_validation_tecu": 45.97, "sdit_tec_residual_tecu": -27.7, "sdit_electron_density_peak_m3": 884764120838.609, "sdit_ionospheric_gradient_tecu_deg": 0.0, "sdit_scintillation_index_s4": 0.1052, "sdit_orbital_geometry_coverage": 0.1696, "sdit_f_layer_height_km": 300.0, "sdit_kp_geomagnetic_index": 0.0, "sdit_solar_zenith_angle_deg": 36.0, "sdit_composite_tomography_score": 55.76, "sdit_data_real": 0.0, "_sdit_data_real_frac": 0.5}, "visibility": {"n_visible": 91, "coverage_fraction": 0.016963941036551744, "horizon_radius_km": 1664.3, "min_elevation_deg": 10.0, "altitude_km": 550.0, "latitude_density_factor": 1.0}, "chapman_tec": {"tec_tecu": 18.27, "n_max_m3": 884764120838.609, "h_max_km": 300.0, "h_scale_km": 50.0, "sza_deg": 36.0, "production_factor": 0.8808, "equatorial_factor": 1.004}}, "mid_latitude_n": {"location": {"lat": 45.0, "lon": -90.0}, "features": {"sdit_n_starlinks_visible": 150.0, "sdit_mean_doppler_shift_hz": 0.0, "sdit_doppler_variance_hz2": 0.0, "sdit_tec_tomographic_tecu": 9.0, "sdit_tec_ionex_validation_tecu": 18.85, "sdit_tec_residual_tecu": -9.85, "sdit_electron_density_peak_m3": 471255642212.5212, "sdit_ionospheric_gradient_tecu_deg": -0.015, "sdit_scintillation_index_s4": 0.05, "sdit_orbital_geometry_coverage": 0.3393, "sdit_f_layer_height_km": 300.0, "sdit_kp_geomagnetic_index": 0.0, "sdit_solar_zenith_angle_deg": 73.4, "sdit_composite_tomography_score": 60.9, "sdit_data_real": 0.0, "_sdit_data_real_frac": 0.5}, "visibility": {"n_visible": 150, "coverage_fraction": 0.03392788207310349, "horizon_radius_km": 1664.3, "min_elevation_deg": 10.0, "altitude_km": 550.0, "latitude_density_factor": 2.0}, "chapman_tec": {"tec_tecu": 9.0, "n_max_m3": 471255642212.5212, "h_max_km": 300.0, "h_scale_km": 46.2, "sza_deg": 73.4, "production_factor": 0.4713, "equatorial_factor": 1.0}}, "high_latitude": {"location": {"lat": 65.0, "lon": 25.0}, "features": {"sdit_n_starlinks_visible": 54.0, "sdit_mean_doppler_shift_hz": 0.0, "sdit_doppler_variance_hz2": 0.0, "sdit_tec_tomographic_tecu": 1.35, "sdit_tec_ionex_validation_tecu": 11.39, "sdit_tec_residual_tecu": -10.04, "sdit_electron_density_peak_m3": 73303713574.63559, "sdit_ionospheric_gradient_tecu_deg": 0.0, "sdit_scintillation_index_s4": 0.0633, "sdit_orbital_geometry_coverage": 0.1018, "sdit_f_layer_height_km": 370.0, "sdit_kp_geomagnetic_index": 0.0, "sdit_solar_zenith_angle_deg": 99.3, "sdit_composite_tomography_score": 45.7, "sdit_data_real": 0.0, "_sdit_data_real_frac": 0.5}, "visibility": {"n_visible": 54, "coverage_fraction": 0.010178364621931045, "horizon_radius_km": 1664.3, "min_elevation_deg": 10.0, "altitude_km": 550.0, "latitude_density_factor": 0.6}, "chapman_tec": {"tec_tecu": 1.35, "n_max_m3": 73303713574.63559, "h_max_km": 300.0, "h_scale_km": 44.6, "sza_deg": 99.3, "production_factor": 0.0733, "equatorial_factor": 1.0}}, "mid_latitude_s": {"location": {"lat": -35.0, "lon": 150.0}, "features": {"sdit_n_starlinks_visible": 131.0, "sdit_mean_doppler_shift_hz": 0.0, "sdit_doppler_variance_hz2": 0.0, "sdit_tec_tomographic_tecu": 0.62, "sdit_tec_ionex_validation_tecu": 14.72, "sdit_tec_residual_tecu": -14.1, "sdit_electron_density_peak_m3": 31791531351.40647, "sdit_ionospheric_gradient_tecu_deg": 0.0, "sdit_scintillation_index_s4": 0.05, "sdit_orbital_geometry_coverage": 0.2438, "sdit_f_layer_height_km": 350.0, "sdit_kp_geomagnetic_index": 0.0, "sdit_solar_zenith_angle_deg": 124.4, "sdit_composite_tomography_score": 58.63, "sdit_data_real": 0.0, "_sdit_data_real_frac": 0.5}, "visibility": {"n_visible": 131, "coverage_fraction": 0.02437903490991909, "horizon_radius_km": 1664.3, "min_elevation_deg": 10.0, "altitude_km": 550.0, "latitude_density_factor": 1.437}, "chapman_tec": {"tec_tecu": 0.62, "n_max_m3": 31791531351.40647, "h_max_km": 300.0, "h_scale_km": 47.1, "sza_deg": 124.4, "production_factor": 0.0318, "equatorial_factor": 1.0}}, "polar": {"location": {"lat": 75.0, "lon": -40.0}, "features": {"sdit_n_starlinks_visible": 27.0, "sdit_mean_doppler_shift_hz": 0.0, "sdit_doppler_variance_hz2": 0.0, "sdit_tec_tomographic_tecu": 1.64, "sdit_tec_ionex_validation_tecu": 9.41, "sdit_tec_residual_tecu": -7.77, "sdit_electron_density_peak_m3": 90491243012.73253, "sdit_ionospheric_gradient_tecu_deg": -0.005, "sdit_scintillation_index_s4": 0.09, "sdit_orbital_geometry_coverage": 0.0509, "sdit_f_layer_height_km": 370.0, "sdit_kp_geomagnetic_index": 0.0, "sdit_solar_zenith_angle_deg": 93.0, "sdit_composite_tomography_score": 39.46, "sdit_data_real": 0.0, "_sdit_data_real_frac": 0.5}, "visibility": {"n_visible": 27, "coverage_fraction": 0.005089182310965523, "horizon_radius_km": 1664.3, "min_elevation_deg": 10.0, "altitude_km": 550.0, "latitude_density_factor": 0.3}, "chapman_tec": {"tec_tecu": 1.64, "n_max_m3": 90491243012.73253, "h_max_km": 300.0, "h_scale_km": 43.8, "sza_deg": 93.0, "production_factor": 0.0905, "equatorial_factor": 1.0}}}, "physics": {"ka_downlink_ghz": 18.5, "orbital_altitude_km": 550.0, "orbital_velocity_ms": 7500.0, "chapman_h_max_km": 300.0, "chapman_h_scale_km": 50.0}, "timestamp": "2026-11-13T15:13:43.805280+00:00", "demo": true, "synthetic": true, "data_real": 0, "demo_notice": "DEMO OUTPUT: computed from synthetic or demonstration input to show what this endpoint returns. It is not a measurement, a detection or a prediction, and no number in it describes a real place or event."}