Extended and circled filaments and underlying surfaces observed in chromospheric and coronal lines
The physical conditions in the extended and circled filaments and underlying surfaces are investigated. There are noticeable differences between the extended and circled filaments in their appearances and average physical conditions. The extended filaments are more stable and over the time of moving across the disk their appearance changes slightly both in the chromosphere and corona. The same relates to underlying surfaces of the extended filaments. The observations of filaments in chromospheric and coronal lines show that the extended filaments often reach greater heights than the circled filaments. Аll the considered extended filaments longer than 40 degrees by longitude or latitude (not only used in this paper) were observed in chromospheric and coronal lines with their underlying surfaces. A part of the circled filaments is observed only in the chromosphere. In corona only their underlying surfaces are seen.
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