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Published October 1998 | public
Journal Article

Properties and Motions of Ellerman Bombs

Abstract

We studied the properties and proper motions of Ellerman bombs (EBs) around a sunspot in a mature active region using high-resolution off-band Hα filtergrams together with nearly simultaneous magnetograms. Sixty-four percent of the EBs (class I) did not correspond accurately to enhanced magnetic field elements while the rest corresponded well to such elements (class II), which all were moving magnetic features (MMFs). We studied the lifetimes, shapes and dimensions, contrasts and time profiles of the EBs. These properties were essentially the same for both classes, in agreement with previous authors. Class I EBs did not move but class II EBs tracked the MMFs well, with horizontal proper motions up to a maximum of 1.1 km s^(−1) and their velocity pattern was similar to the velocity pattern of the MMFs.

Additional Information

© Kluwer Academic Publishers 1998. We would like to thank the staff of the Big Bear Solar Observatory for their support. This work was supported by NASA grants NAG5–2782 and NAGW–1972 and NSF grant ATM–9525971. AN would like to thank Dr S. M. White for useful discussions.

Additional details

Created:
August 19, 2023
Modified:
October 25, 2023