---
license: apache-2.0
viewer: false
tags:
- solar
- space-weather
- corona
---


# Probabilistic Forecasting of the Solar Wind by Data Mining Similar Scenarios (Supplemental Data)

This dataset accompanies the paper [*Post-processing Probabilistic Forecasts of the Solar Wind by Data Mining Similar Scenarios*](https://doi.org/10.1029/2025SW004859),  published in the AGU Journal Space Weather in 2026.

It includes the full ADAPT-WSA outputs between 2010-2020 (inclusive) using four maps per day and driven by the GONG network, which is uploaded here because it is too large for Zenodo.

# Citing


If you use this dataset, please cite the publication it came from:


```
@article{https://doi.org/10.1029/2025SW004859,
author = {da Silva, Daniel E. and Parlikar, Yash and Jones, Shaela I. and Arge, Charles N.},
title = {Post-Processing Probabilistic Forecasts of the Solar Wind by Data Mining Similar Scenarios},
journal = {Space Weather},
volume = {24},
number = {4},
pages = {e2025SW004859},
keywords = {solar wind, uncertainty quantification, space weather, potential field, probabilistic forecasting},
doi = {https://doi.org/10.1029/2025SW004859},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2025SW004859},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2025SW004859},
note = {e2025SW004859 2025SW004859},
year = {2026}
}
```

## WSA FITS File Documentation

WSA FITS files are in the `CORONA/` directory.

### HDU #0: Arrays over the Sphere
Merged array of shape (10, 90, 180), representing 10 arrays over spherical coordinates. The arrays are:

| Array Index | Description |
|-------------|-------------|
| 0 | Coronal field at outer boundary (nT) |
| 1 | Flux tube expansion factor eval. at the source surface |
| 2 | Colat. of open field footpoints at photosphere (rad) |
| 3 | Long. of open field footpoints (rad) (Take abs. value of Long and add carrLongitude HDU attribute to get correct value) |
| 4 | Photospheric Field (G) |
| 5 | Dist. from open field footpoint to nearest coronal bndry (deg) |
| 6 | Open (1,2,3) and closed (0) regions on the photosphere (1=in-to-out tracing; 2=out-to-in tracing; 3=both) |
| 7 | Dist. to current sheet at outer boundary |
| 8 | Coronal field at user defined radius (nT) |
| 9 | Squashing factor at outer boundary |

### HDU #1: Arrays over Subsatellite Track +/- 1 Grid Cell
Merged array of shape (8, 3, 180), representing data alond the L1 subsatellite track +/- one grid cell (dimension of 3).The dimension 8 arrays are:

| Array Index | Description |
|-------------|-------------|
| 0 | Coronal field at outer boundary (nT) |
| 1 | Flux-tube expansion factor eval. at the source surface |
| 2 | Colat. of open field footpoints at photosphere (rad) |
| 3 | Long. of open field footpoints at photosphere (rad) |
| 4 | Photospheric field (G) |
| 5 | Dist. from open field footpoint to nearest coronal bndry (deg) |
| 6 | Dist. from subsatellite point to current sheet (deg) |
| 7 | Squashing factor eval. at outer boundary |

### HDU #2: More Arrays over Subsatellite Track
Merged array of shape (4, 180), representing data along the L1 subsatellite track. The dimension 4 arrays are:

| Array Index | Description |
|-------------|-------------|
| 0 | co-lat. of subsatellite track (rad) |
| 1 | orbital radius of subsatellite track (AU) |
| 2 | julian date of subsatellite track |
| 3 | b angles correspond to values when central longs of pixels lie on CM |

### HDU #3: Coronal Potential Field Source Surface (PFSS) Spherical Harmonic Coefficients 

Array of shape (2, 91, 91) representing the G and H spherical harmonic coefficients of the coronal PFSS solution, Schmidt normalized. Because the files were written in fortran, these are upper triangular matrices when read in C array order. We recommend the [PySHTools](https://shtools.github.io/SHTOOLS/) library for working with spherical harmonics in python, including evaluating `B` vectors at arbitrary points.

### HDU #4: Internal Records
This HDU holds internal records and can be ignored. 

## Contact
Daniel da Silva, [daniel.e.dasilva@nasa.gov](daniel.e.dasilva@nasa.gov)