| Autor: |
Brants, J., Steenbeek, J. |
| Zdroj: |
Solar Physics; Apr1985, Vol. 96 Issue 2, p229-252, 24p |
| Abstrakt: |
We describe the morphological evolution of photospheric features in an emerging flux region (EFR), on the basis of high-resolution photographs taken with the Vacuum Tower Telescope at Sacramento Peak Observatory. Individual alignments of darkened intergranular lanes have a lifetime of only about 10 min; they may represent the tops of emerging flux loops. Roundish darkened patches within the intergranular lanes (protopores) may precede the birth of a pore, or may disappear again within a few hours. The birth of one pore coincides with the area of a conspicuous downflow observed in the spectrograms. The majority of the pores in the EFR grow in area and darken; their growth times vary between 1 and 6 hr. Various modes of growth are observed. Some pores dissolve again within a few hours after their birth. The long axis of the whole EFR rotates by 2 deg hr towards alignment parallel to the equator, with leading polarity closest to the equator. The ring of pores surrounding the EFR expands with velocities of about 0.7 km s in the east-west direction. There is strong velocity shear: the leading edge of the leading pore moves perpendicular to the general expansion of the ring of pores. Filigree is absent near the fast growing pores of following polarity and near the alignments. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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