Sub-day F10.7 Indices Generated from RSTN Data

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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.

Author(s):
White, Stephen M
Author Organization(s):
AFRL Space Vehicles Directorate
Funding Organization(s):
Publication Date:
2016 Nov 15
Pagination:
0

Security Markings

RECORD

Collection: TRECMS
Subject Terms
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
solar activity, measurement, observatories, solar cycle, astronomical observatories, calibration, space weather, spectra, standards, sun, astronomy, atmospheres, cycles, emission, frequency, intervals, polarimeters
Keyword(s):
solar radio emission, F10.7 index, RSTN (Radio Solar Telescope Network), sub-day-cadence proxies, Radio Spectra, Nobeyama Polarimeter Fluxes, solar radio flux, rims (RSTN Radio Interference Monitoring Sets), RSTN sites
Subject Categories:
Astronomy and Astrophysics; Astronomy and Astrophysics
Update Date:
2020 Oct 01