Temporal properties of He I 1083 nm dark points

Details Temporal properties of He I 1083 nm dark points Temporal properties of He I 1083 nm dark points

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000soph..191...85m&link_type=abstract

Solar Physics, v. 191, Issue 1, p. 85-96 (2000).

Physics

4

Scientific paper

The intensity of a sample of large, high-contrast and isolated dark points has been observed with full-disk images in the light of Hei 1083 nm from the Chromospheric Helium line Intensity Photometer (CHIP) on Mauna Loa, Hawaii. Temporal variations in the intensity encompassing a broad range of time scales have been recorded. Long-term changes in the intensity, although highly variable, are characterized by e-folding times on the order of 5 h. Superposed on these variations are frequent intensity variations, which occur over time scales ranging from the typical observing cadence of 3 min, to tens of minutes. Microflares-involving intensity changes of at least 50% over periods of minutes are observed frequently. Rapid cadence (½ min) observations reveal differences between rise and decay times and shorter-term variations in the intensity profiles of these microflares.

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