# Galactic cosmic ray hydrogen spectra and radial gradients in the inner heliosphere measured by the HELIOS Experiment 6

## TL;DR

This study utilizes HELIOS Experiment 6 data to analyze galactic cosmic ray hydrogen spectra and their radial gradients within the inner heliosphere, providing insights into cosmic ray propagation and solar modulation effects.

## Contribution

It demonstrates the application of E6 data for calculating cosmic ray fluxes and models their behavior at different heliospheric distances, highlighting new insights into GCR and ACR propagation.

## Key findings

- Fluxes align with the force field model for GCRs
- GCR radial gradients differ between inner and outer heliosphere
- E6 data effectively characterizes cosmic ray spectra

## Abstract

Context: The HELIOS solar observation probes provide unique data regarding their orbit and operation time. One of the onboard instruments, the Experiment 6 (E6), is capable of measuring ions from 4 to several hundred MeV/nuc. Aims: In this paper we aim to demonstrate the relevance of the E6 data for the calculation of galactic cosmic ray (GCR), anomolous cosmic ray (ACR), and solar energetic particle (SEP) fluxes for different distances from the sun and time periods. Methods: Several corrections have been applied to the raw data: determination of the Quenching factor of the scintillator, correction of the temperature dependent electronics, degradation of the scintillator as well as the effects on the edge of semi-conductor detectors. Results: Fluxes measured by the E6 are in accordance with the force field solution for the GCR and match models of the anomalous cosmic ray propagation. GCR radial gradients in the inner heliosphere show a different behaviour than in the outer heliosphere