Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh31b1796b&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH31B-1796
Astronomy and Astrophysics
Astrophysics
[7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7529] Solar Physics, Astrophysics, And Astronomy / Photosphere
Scientific paper
A primary objective of current and future solar magnetic field observations is to provide an accurate description of the spatial and temporal distribution of the photospheric magnetic field. These observations are usually merged together over an extended period of time, typically a solar rotation, to produce 360-degree surface maps of the magnetic flux distribution that are regularly used today in several space weather programs. As the main drivers for coronal and heliospheric models, the quality of the maps will ultimately test the diagnostic capabilities of these models and our ability to model the state of the inner heliosphere. Different techniques have been used to construct global magnetic maps of the solar surface from selected set of magnetograms. In our study we have compared the impact of using either diachronic or synchronic maps for predicting the background solar wind speed at Earth. For this purpose we used a potential field source surface model driven by 1-degree resolution full Carrington rotation (CR) radial maps, combined with the Wang-Sheeley-Arge model. The radial maps were produced for CR 2055 to CR 2087 using SOLIS longitudinal magnetic field observations in the spectral line of Fe I at 630.15nm. The quality of each of these maps is then validated by comparing the predicted background solar wind speeds to the observed values as measured by ACE.
Bertello Luca
Petrie G. J.
Tran T. T.
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