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Journal Articles Advances in Space Research Year : 2016

## Neutron monitors and muon detectors for solar modulation studies: 2. $\phi$ time series

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A. Ghelfi
• Function : Author
D. Maurin
• Function : Author
A. Cheminet
• Function : Author
L. Derome
• Function : Author
G. Hubert
• Function : Author
F. Melot
• Function : Author

#### Abstract

The level of solar modulation at different times (related to the solar activity) is a central question of solar and galactic cosmic-ray physics. In the first paper of this series, we have established a correspondence between the uncertainties on ground-based detectors count rates and the parameter $\phi$ (modulation level in the force-field approximation) reconstructed from these count rates. In this second paper, we detail a procedure to obtain a reference $\phi$ time series from neutron monitor data. We show that we can have an unbiased and accurate $\phi$ reconstruction ($\Delta\phi/\phi\simeq 10\%$). We also discuss the potential of Bonner spheres spectrometers and muon detectors to provide $\phi$ time series. Two by-products of this calculation are updated $\phi$ values for the cosmic-ray database and a web interface to retrieve and plot $\phi$ from the 50's to today (\url{http://lpsc.in2p3.fr/crdb}).

### Dates and versions

in2p3-01343560 , version 1 (08-07-2016)

### Identifiers

• HAL Id : in2p3-01343560 , version 1
• ARXIV :
• DOI :

### Cite

A. Ghelfi, D. Maurin, A. Cheminet, L. Derome, G. Hubert, et al.. Neutron monitors and muon detectors for solar modulation studies: 2. $\phi$ time series. Advances in Space Research, 2016, 60, pp.833-847. ⟨10.1016/j.asr.2016.06.027⟩. ⟨in2p3-01343560⟩

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