Limits to the accuracy of the 10.7 cm flux

Autor:	D. P. Charrois, K. F. Tapping
Rok vydání:	1994
Předmět:	Physics Solar flare business.industry Flux Astronomy and Astrophysics Atmospheric temperature Atmospheric sciences Solar physics Radio telescope Filter (large eddy simulation) Wavelength Optics Space and Planetary Science business Radio astronomy
Zdroj:	Solar Physics. 150:305-315
ISSN:	1573-093X 0038-0938
DOI:	10.1007/bf00712892
Popis:	The 10.7 cm flux data, which are widely used as an index of solar activity, are actually spot measurements of the solar flux density at 10.7 cm wavelength, made three times each day, usually at 17:00, 20:00, and 23:00 UT. These values, or the 20:00 UT determination alone, are frequently used as the average flux for that day. Since each spot measurement takes about one hour to make, and the Sun's emissions at that wavelength can vary over time scales shorter than the intervals between the measurements, the data are unavoidably undersampled. Radio emissions from transient events, such as flares, are defined as contaminants of the flux, and largely-empirical procedures have evolved which are used to filter them from the data.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1b9409a8728aba4c0068b08522c602fa https://doi.org/10.1007/bf00712892 Zobrazit plný text záznamu Full text from SpringerLink