---
title: "Space weather and band conditions"
method: GET
path: "/v1/propagation"
tags: ["HF propagation"]
---

# Space weather and band conditions

`GET /v1/propagation`

## Request

- Base URL: `https://api.dharun.dev`
- URL: `https://api.dharun.dev/v1/propagation`
- Auth: none declared

Rules behind the band ratings: 80m-40m: fair by day (D-layer absorption), good at night. 30m-20m: good by day; at night good from a solar flux of 120, fair from 80, else poor. 17m-15m: by day good from a solar flux of 110, fair from 80, else poor; at night fair from 150, else poor. 12m-10m: by day good from a solar flux of 150, fair from 110, else poor; at night fair from 200, else poor. A K-index of 4 lowers every night rating one step; 5 or more lowers every rating one step, and 7 or more two. An M-class X-ray flux lowers the day rating of 80m-40m and 30m-20m one step; X-class makes every day rating poor. Readings NOAA did not publish at the last fetch are null.

## Response `200`

Success

- Envelope
  - `data` unknown, required
  - `meta` object, required
    - `limit` integer
    - `note` string
    - `offset` integer
    - `source` object: Where the data came from and the credit its licence asks for.
      - `attribution` string
      - `licence` string
      - `name` string
      - `retrieved` string
      - `url` string
      - `version` string
    - `total` integer

## Other responses

- `400`: Error
- `404`: Error
- `429`: Error

---

[API](https://skmtc.dev/dharun/apis/india-api-free-open-source-apis-for-indian-data.md) · [All operations](https://skmtc.dev/dharun/apis/india-api-free-open-source-apis-for-indian-data/llms.txt) · [OpenAPI document](https://skmtc.dev/dharun/apis/india-api-free-open-source-apis-for-indian-data/revisions/ecd8b0ec7863?raw)