Comparison of prominences in Hα and He II 304 Å

Document Type

Article

Publication Date

1-1-1998

Abstract

In this letter, we bring attention to prominences which show different morphology in Hα and He II 304 Å, as observed simultaneously by BBSO and EIT on board SOHO. Those two lines have been thought to represent similar chromospheric structures although they are formed at significantly different temperatures. We give two examples representing two kinds of anomaly: (1) prominences showing strong Hα emissions in the lower part and strong He II emissions in the upper part, and (2) erupting prominences showing extensive He II emission, but nothing in Hα. Our results indicate that a part or the whole of a prominence may be too hot to emit Hα radiation, possibly due to heating or thermal instability. Please note that these are not just two isolated cases, many other prominences show the similar differences in Hα and He II 304 Å.

Identifier

0002425099 (Scopus)

Publication Title

Solar Physics

External Full Text Location

https://doi.org/10.1023/A:1005010504873

ISSN

00380938

First Page

91

Last Page

96

Issue

1

Volume

183

Grant

ATM-962886

Fund Ref

National Science Foundation

This document is currently not available here.

Share

COinS