Table 1
List of the proxies included in our comparison. For each proxy, we indicate the temporal granularity of the series used to fit the proxy (day, month, year; simple means or running means), and the SN version on which the proxy was based. The label identifies the curves in the associated figures, and the corresponding formulae are given in Table 2.
| Source | Temporal base | SN version | Plot label |
|---|---|---|---|
| Kuklin (1984) | Unknown | 1 | KU1984_V1 |
| Holland & Vaughn (1984) | 13-month smoothed | 1 | HV1984_V1 |
| Xanthakis & Poulakos (1984) | 1 day | 1 | XP1985_V1 |
| Hathaway et al. (2002) | 24-month Gaussian smoothed | 1 | HA2002_V1 |
| Zhao & Han (2008), Formula 1 | 1-year mean | 1 | ZH2008_F1 |
| Zhao & Han (2008), Formula 3 | 1-year mean | 1 | ZH2008_F3 |
| Svalgaard (2009) | 1-month mean | 1 | SV2009_V1 |
| IPS Australia (Thompson, 2010) | 1-month mean | 1 | IPS2011_V1 |
| Tapping & Valdés (2011) | 1-year mean | 1 | T2011_V1 |
| Johnson (2011) Formula 1 monthly | 1-month mean | 1 | J2011_F1ma |
| Johnson (2011) Formula 1 yearly | 1-year mean | 1 | J2011_F1ya |
| Johnson (2011) Formula 2 monthly | 1-month mean | 1 | J2011_F2ma |
| Johnson (2011) Formula 2 yearly | 1-year mean | 1 | J2011_F2y |
| NOAA-SWPC (2016) | Unknown | 2 | NOAA_V2 |
| Tapping and Morgan (2017) SN version 1 | 10-month smoothed | 1 | T2017_V1 |
| Tapping & Morgan (2017) SN version 2 | 10-month smoothed | 2 | T2017_V2 |
| Tiwari & Kumar (2018) Formula 1 | 1-month mean | 2 | TK2018_F1 |
| Tiwari & Kumar (2018) Formula 2 | 1-month mean | 2 | TK2018_F2 |
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.