Sub-day F10.7 Indices Generated from RSTN Data
Abstract
We investigate the suitability of Radio Solar Telescope Network (RSTN) measurements as a source of sub-day-cadence proxies for the solar-activity index F10.7. We demonstrate the limits on the reliability of the RSTN calibration and its variation across the four RSTN observatories. We show that fitting a spectrum to the RSTN frequencies around 2.8 GHz does not provide a useful proxy when the raw RSTN data are used. Instead, we demonstrate a method in which the 2.7 GHz fluxes at each observatory are scaled to F10.7 using a median ratio over 10day periods. The scaled RSTN data results in relative errors around 4% over a solar cycle, improving to 2% when obvious outliers in the RSTN data are excluded. This is less than the day-to-day variation in F10.7 itself, demonstrating that the proxy proposed can function as a sub-day F10.7 index.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 15, 2016
- Accession Number
- AD1109219
Entities
People
- Stephen White