# FM301 Data Standard

**URL:** https://openradar.discourse.group/c/fm301/13.md

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## [About the FM301 Data Standard category](https://openradar.discourse.group/t/about-the-fm301-data-standard-category/309)

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**Author:** [@mgrover1](https://openradar.discourse.group/u/mgrover1)\
**Replies:** 0

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## [Order of radar rays in a sweep](https://openradar.discourse.group/t/order-of-radar-rays-in-a-sweep/630)

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**Author:** [@guntherhaase](https://openradar.discourse.group/u/guntherhaase)\
**Replies:** 4\
**Last updated:** [September 2, 2025, 1:02pm UTC](https://openradar.discourse.group/t/order-of-radar-rays-in-a-sweep/630 "2025-09-02T13:02:35Z")

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Do you know if FM301 requires a specific order of radar rays in a sweep, e.g. based on time or angle? I could find any information on this in the documentation.

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## [FM301 attribute sun\_power\_hc](https://openradar.discourse.group/t/fm301-attribute-sun-power-hc/631)

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**Author:** [@guntherhaase](https://openradar.discourse.group/u/guntherhaase)\
**Replies:** 3\
**Last updated:** [August 13, 2025, 2:18pm UTC](https://openradar.discourse.group/t/fm301-attribute-sun-power-hc/631 "2025-08-13T14:18:38Z")

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What is the exact definition of the FM301 attribute /radar\_calibration/sun\_power\_hc and what is its purpose?