Welcome to SWA-PAS L2 Data User Guide !
For news and other documentation visit Solar Orbiter PAS's IRAP Page.
Proton Alpha Sensor (PAS) is an instrument for measuring protons (H+) and alphas (He++) in the solar wind. PAS is a part of Solar Wind Analyzer (SWA) suite onboard Solar Orbiter. PAS measures ion velocity distribution functions (VDFs) in 3D that consists of energy, elevation, and azimuth.
Document scope
This document contains a short description of the Solar Orbiter SWA-PAS sensor and the measurement implementation, a short description of the L2 data and data frames, and a description of how to interpret the velocity distribution function (VDF), and the known data caveats.
Acronyms
| Abbreviations | Description |
|---|---|
| SWA | Solar Wind Analyzer |
| PAS | Proton Alpha Sensor |
| SRF | Spacecraft Reference Frame |
| RTN | Radial Tangential Normal Frame |
| VDF | Velocity Distribution Function |
Parameters
| Parameters | Description |
|---|---|
| K | Number of samplings per second |
| NE | Number of energy bins |
| SE | Start Energy bin |
| NEL | Number of ELevation bins |
| SEL | Start ELevation bin |
!!! Note
This site is under an active development.
Authors
Andrei Fedorov (andrei.fedorov@irap.omp.eu) Version V02 11/16/2020
Rungployphan Kieokaew (rkieokaew@irap.omp.eu) Last update: 25/06/2022