Study of Differences Between Sunspot and White Light Facular Area Data Determined from SDO/HMI and SOHO/MDI Observations

Autor:	L. Győri
Rok vydání:	2012
Předmět:	Physics Sunspot Space and Planetary Science Observatory White light Astronomy Astronomy and Astrophysics Solar irradiance Image resolution
Zdroj:	Solar Physics. 280:365-378
ISSN:	1573-093X 0038-0938
DOI:	10.1007/s11207-012-9987-7
Popis:	Sunspot and white light facular areas are important data for solar activity and are used, for example, in the study of the evolution of sunspots and their effect on solar irradiance. Solar Dynamic Observatory’s Helioseismic and Magnetic Imager (SDO/HMI) solar images have much higher resolution (∼0.5′′ pixel−1) than Solar and Heliospheric Observatory’s Michelson Doppler Imager (SOHO/MDI) solar images (∼2′′ pixel−1). This difference in image resolution has a significant impact on the sunspot and white light facular areas measured in the two datasets. We compare the area of sunspots and white light faculae derived from SDO/HMI and SOHO/MDI observations. This comparison helps the calibration of the SOHO sunspot and facular area to those in SDO observations. We also find a 0.22 degree difference between the North direction in SDO/HMI and SOHO/MDI images.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::68e20fefa69ca859f1f0161b5a147d02 https://doi.org/10.1007/s11207-012-9987-7 Zobrazit plný text záznamu Plný text ve formátu PDF