An erupting macrospicule. Characteristics derived from SOHO-CDS spectroscopic observations

Details An erupting macrospicule. Characteristics derived from SOHO-CDS spectroscopic observations An erupting macrospicule. Characteristics derived from SOHO-CDS spectroscopic observations

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...384..303p&link_type=abstract

Astronomy and Astrophysics, v.384, p.303-316 (2002)

Astronomy and Astrophysics

Astrophysics

6

Sun: Corona, Sun: Activity

Scientific paper

We report results from the analysis of a sequence of SOHO/CDS observations obtained off-limb in the south polar coronal hole on 6 March 1998. Three successive data sets were obtained with the Normal Incidence Spectrometer (NIS), the first of which showed a jet-like feature visible in the chromospheric and low transition region lines. The morphological characteristics of this feature suggested it was a macrospicule. The two remaining observations of the same region indicated a quiet coronal hole with a density of 108 cm-3 and a temperature rising from 0.95 x 106 K near the limb to 1.2 x 106 K at about 4.7 x 104 km above the limb. These data were averaged and used as ``background'' for the macrospicule observation. The resulting subtracted spectra showed more details of the feature. In particular, a cloud of plasma was detected at about 3 x 104 km above the limb. The macrospicule was found to have a density of the order of 1010 cm-3 and a temperature of about 2-3 x 105 K. The initial outflow velocity near the limb was over 80 km s-1. This decreased to a terminal value of 26 km s-1 above about 6 x 104 km.

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