suns 0.0.3

Sun celestial simulation crate for the MilkyWay SolarSystem workspace
Documentation 
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use suns::{events, interactions, layers, physics, plasma};

const DEFAULT_DT_S: f64 = 3600.0;
const STEP_COUNT: usize = 500;

struct SunDiagnostics {
    elapsed_days: f64,
    core_luminosity_w: f64,
    surface_flux_wm2: f64,
    surface_temperature_k: f64,
    photon_diffusion_speed_ms: f64,
    convective_velocity_ms: f64,
    chromosphere_scale_height_m: f64,
    radiative_zone_volume_m3: f64,
    alfven_speed_corona_ms: f64,
    coronal_temperature_k: f64,
    coronal_plasma_beta: f64,
    solar_wind_speed_ms: f64,
    solar_wind_density_m3: f64,
    parker_spiral_angle_deg: f64,
    sunspot_number: f64,
    sunspot_latitude_deg: f64,
    cme_rate_per_day: f64,
    flare_rate_xclass: f64,
    prominence_mass_kg: f64,
    tidal_force_total_n: f64,
    barycenter_offset_m: f64,
    magnetic_cycle_phase: f64,
    tsi_wm2: f64,
    checksum: f64,
}

impl Default for SunDiagnostics {
    fn default() -> Self {
        Self {
            elapsed_days: 0.0,
            core_luminosity_w: 0.0,
            surface_flux_wm2: 0.0,
            surface_temperature_k: 0.0,
            photon_diffusion_speed_ms: 0.0,
            convective_velocity_ms: 0.0,
            chromosphere_scale_height_m: 0.0,
            radiative_zone_volume_m3: 0.0,
            alfven_speed_corona_ms: 0.0,
            coronal_temperature_k: 0.0,
            coronal_plasma_beta: 0.0,
            solar_wind_speed_ms: 0.0,
            solar_wind_density_m3: 0.0,
            parker_spiral_angle_deg: 0.0,
            sunspot_number: 0.0,
            sunspot_latitude_deg: 0.0,
            cme_rate_per_day: 0.0,
            flare_rate_xclass: 0.0,
            prominence_mass_kg: 0.0,
            tidal_force_total_n: 0.0,
            barycenter_offset_m: 0.0,
            magnetic_cycle_phase: 0.0,
            tsi_wm2: 0.0,
            checksum: 0.0,
        }
    }
}

impl SunDiagnostics {
    fn recompute_checksum(&mut self) {
        self.checksum = self.elapsed_days
            + self.core_luminosity_w * 1e-26
            + self.surface_flux_wm2 * 1e-7
            + self.surface_temperature_k * 1e-3
            + self.photon_diffusion_speed_ms * 1e-5
            + self.convective_velocity_ms * 1e-3
            + self.chromosphere_scale_height_m * 1e-6
            + self.radiative_zone_volume_m3 * 1e-30
            + self.alfven_speed_corona_ms * 1e-6
            + self.coronal_temperature_k * 1e-6
            + self.coronal_plasma_beta
            + self.solar_wind_speed_ms * 1e-5
            + self.solar_wind_density_m3 * 1e-6
            + self.parker_spiral_angle_deg * 0.01
            + self.sunspot_number * 0.01
            + self.sunspot_latitude_deg * 0.1
            + self.cme_rate_per_day
            + self.flare_rate_xclass
            + self.prominence_mass_kg * 1e-12
            + self.tidal_force_total_n * 1e-20
            + self.barycenter_offset_m * 1e-9
            + self.magnetic_cycle_phase
            + self.tsi_wm2 * 1e-3;
    }
}

struct SunSimulation {
    cycle: events::sunspots::SunspotCycle,
    diagnostics: SunDiagnostics,
    elapsed_s: f64,
}

impl SunSimulation {
    fn new() -> Self {
        Self {
            cycle: events::sunspots::cycle_25(),
            diagnostics: SunDiagnostics::default(),
            elapsed_s: 0.0,
        }
    }

    fn tick(&mut self, dt_s: f64) {
        self.elapsed_s += dt_s;
        let cycle_period = suns::SOLAR_CYCLE_YEARS * suns::SECONDS_PER_YEAR;
        self.cycle.phase = (self.elapsed_s % cycle_period) / cycle_period;

        let photosphere = layers::photosphere::Photosphere::new();
        let chromosphere = layers::chromosphere::Chromosphere::new();
        let convective = layers::convective_zone::ConvectiveZone::new();
        let radiative = layers::radiative_zone::RadiativeZone::new();

        let corona = plasma::corona::quiet_corona();
        let wind = plasma::solar_wind::SolarWindState::slow_wind_1au();
        let prominence = plasma::prominences::Prominence::quiescent();

        let rz_transfer = physics::energy_transport::radiative_zone_transfer();
        let core_lum = physics::nuclear_fusion::core_luminosity();

        let ssn = self.cycle.current_ssn();
        let tsi = self.cycle.total_solar_irradiance();
        let butterfly_lat = self.cycle.butterfly_latitude_deg();
        let cme_rate = events::coronal_mass_ejections::cme_rate_at_cycle_phase(self.cycle.phase);

        let tidal_total = interactions::tidal_forces::total_planetary_tidal_force();
        let bary_offset = interactions::tidal_forces::solar_barycenter_offset();

        self.diagnostics = SunDiagnostics {
            elapsed_days: self.elapsed_s / 86_400.0,
            core_luminosity_w: core_lum,
            surface_flux_wm2: photosphere.surface_flux(),
            surface_temperature_k: photosphere.temperature_k,
            photon_diffusion_speed_ms: rz_transfer.photon_diffusion_speed(),
            convective_velocity_ms: convective.convective_velocity(0.85),
            chromosphere_scale_height_m: chromosphere
                .scale_height(chromosphere.temperature_at_height(0.5)),
            radiative_zone_volume_m3: radiative.volume_m3(),
            alfven_speed_corona_ms: corona.alfven_speed(),
            coronal_temperature_k: corona.temperature_k,
            coronal_plasma_beta: corona.plasma_beta(),
            solar_wind_speed_ms: wind.speed_ms,
            solar_wind_density_m3: wind.density_m3,
            parker_spiral_angle_deg: wind.parker_spiral_angle_deg(),
            sunspot_number: ssn,
            sunspot_latitude_deg: butterfly_lat,
            cme_rate_per_day: cme_rate,
            flare_rate_xclass: events::solar_flares::FlareCategory::XClass.frequency_per_day(),
            prominence_mass_kg: prominence.mass_kg(),
            tidal_force_total_n: tidal_total,
            barycenter_offset_m: bary_offset,
            magnetic_cycle_phase: self.cycle.phase,
            tsi_wm2: tsi,
            checksum: 0.0,
        };
        self.diagnostics.recompute_checksum();
    }
}

fn main() {
    let mut simulation = SunSimulation::new();
    for _ in 0..STEP_COUNT {
        simulation.tick(DEFAULT_DT_S);
    }
}