@Article{SelhorstKalCasValCos:2019:SoRa37,
author = "Selhorst, Caius L. and Kallunki, Juha and Castro, Carlos Guillermo
Gim{\'e}nez de and Valio, Adriana and Costa, Joaquim Eduardo
Rezende",
affiliation = "{Universidade Cruzeiro do Sul} and {Mets{\"a}hovi Radio
Observatory} and {Universidade Presbiteriana Mackenzie} and
{Universidade Presbiteriana Mackenzie} and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "The solar radius at 37 GHz through cycles 22 to 24",
journal = "Solar Physics",
year = "2019",
volume = "294",
number = "12",
pages = "e175",
month = "Nov.",
keywords = "Sun: radio radiation · Solar cycle · Sun: radius.",
abstract = "To better understand the influence of the activity cycle on the
solar atmosphere, we report the time variation of the radius
observed at 37 GHz (\λ = 8.1 mm) obtained by the
Mets{\"a}hovi Radio Observatory (MRO) through Solar Cycles 22 to
24 (1989 2015). Almost 5800 maps were analyzed, however, due to
instrumental setup changes the dataset showed four distinct
behaviors, which required a normalization process to allow for the
whole interval analysis. When the whole period was considered, the
results showed a positive correlation index of 0.17 between the
monthly means of the solar radius at 37 GHz and solar flux
obtained at 10.7 cm (F10.7). This correlation index increased to
0.44, when only the data obtained during the last period without
instrumental changes were considered (1999 2015). The solar radius
correlation with the solar cycle agrees with the previous results
obtained at mm/cm wavelengths (17 and 48 GHz), nevertheless, this
result is the opposite of that reported at submillimeter
wavelengths (212 and 405 GHz).",
doi = "10.1007/s11207-019-1568-6",
url = "http://dx.doi.org/10.1007/s11207-019-1568-6",
issn = "0038-0938 and 1573-093X",
language = "en",
targetfile = "selhorst_solar.pdf",
urlaccessdate = "25 abr. 2024"
}