This repository contains a Solaris-Small checkpoint trained for 12-hour multi-wavelength solar forecasting, following the Solaris pretraining setup from Solaris: A Foundation Model of the Sun.

This checkpoint supersedes the earlier patch-size-8 upload. It was trained with a chronological 80/10/10 split, a 24-hour guard band at split boundaries, AdamW weight decay 0.05, and no EMA weights.

The checkpoint was trained on hrrsmjd/AIA_12hour_512x512 for 7750 optimizer steps using two history frames (t-12h, t) to predict all eight pretraining wavelengths at t+12h.

Files

solaris_small_patch8_model_state_dict.pt: reusable PyTorch checkpoint containing model_state_dict, learned normalization coefficients, wavelengths, scale factors, patch size, seed, split metadata, test metrics, training step, and final training loss.
config.json: lightweight metadata for reconstructing the model and normalization.
assets/solaris_small_patch8_test0_prediction.png: example qualitative test prediction plot.
eval/solaris_pretrain_p8_chronosplit_wd005_noema_test_mse_subset_0941.md: full chronological test-split raw-scale MSE/RMSE/MAE report.

Example Plot

The plot below shows one test sample with rows for input t-12h, input t, target t+12h, prediction t+12h, and prediction - target across all eight wavelengths.

Model Details

Architecture: SolarisSmall
Patch size: 8
Embedding dimension: 256
Encoder depths: (2, 6, 2)
Decoder depths: (2, 6, 2)
Output wavelengths: 0094, 0131, 0171, 0193, 0211, 0304, 0335, 1600
Training dataset: hrrsmjd/AIA_12hour_512x512
Training target: 12-hour forecast
Split scheme: chronological 80/10/10 over valid samples with a 24-hour boundary guard band
Split counts: train 7541, validation 939, test 941
Training budget: 7750 optimizer steps, batch size 8, gradient accumulation 4
Optimizer: AdamW, lr=5e-4, cosine decay to 5e-5, weight_decay=0.05, betas (0.9, 0.95)
EMA: disabled
Seed: 42

Loading

python

import torch

from solaris.model.solaris import SolarisSmall

checkpoint = torch.load("solaris_small_patch8_model_state_dict.pt", map_location="cpu", weights_only=False)

model = SolarisSmall(
    out_levels=len(checkpoint["wavelengths"]),
    patch_size=checkpoint["patch_size"],
)
model.load_state_dict(checkpoint["model_state_dict"])
model.eval()

scale_factors = torch.tensor(checkpoint["scale_factors"], dtype=torch.float32)
norm_coeff_1 = checkpoint["norm_coeff_1"]
norm_coeff_2 = checkpoint["norm_coeff_2"]

Inputs should be normalized with the Solaris transform used during training. Model outputs are normalized intensities; multiply by the per-wavelength scale factors before comparing to raw-intensity targets.

Test Metrics

Metrics below use all 941 chronological test samples and are computed on the raw intensity scale.

Wavelength (A)	MSE	RMSE	MAE
0094	7.08928	2.66257	0.310692
0131	147.528	12.1461	1.44793
0171	13730.9	117.179	52.9684
0193	22906.6	151.349	62.3088
0211	7752.18	88.0464	35.0413
0304	1556.87	39.4572	14.2213
0335	48.0333	6.9306	2.0811
1600	145.126	12.0468	7.3929
Mean	5786.78	53.7272	21.9716

Training Notes

Scale factors were computed as half the average per-image maximum over unique train-split timestamps:

[57.944149103084534, 214.99738922760267, 1590.2998402078304, 2397.489401917806, 1080.261734048243, 830.778793198845, 104.45557294825853, 274.65685334356664]

The final logged training-batch metrics at step 7750 were:

text

weighted MAE: 0.007597
mean raw RMSE: 19.576
per-wavelength raw RMSE: [1.210, 4.034, 49.249, 53.399, 20.770, 17.612, 1.653, 8.684]

hrrsmjd/solaris_small_patch8

Solaris Small Patch 8