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NOBEYAMA98
ABSTRACT
Deadline: September 5, 1998
Please send by E-MAIL to nbym98@solar.nro.nao.ac.jp.
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{\large\bf { Multi-Wavelength Observations of Eruptive Prominence
on 28 August 1992
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{\bf {Ta.~Watanabe$^{1}$, M.~Yamamoto$^{1}$, Y.~Nakagawa$^{1}$,
K.~Ashizawa$^{1}$,
H.~Miyazaki$^{2}$, M.~Irie$^{2}$, K.~Ichimoto $^{2}$
H.~Kurokawa$^{3}$, H.~Hudson$^{4}$, H. Yatagai $^{5}$\\}}
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$^1$ {Department of Environmental Sciences, Ibaraki University} \\
$^2$ {National Astronomical Observatory} \\
$^3$ {Hida Observatory, Kyoto University} \\
$^4$ {Solar Physics Research Corp., and ISAS} \\
$^5$ {Fujitsu, Co. Ltd} \\
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We examine H$\alpha$, soft X-ray and radio observations to study an
eruptive-prominence
event taking place above the eastern solar limb on 28 August 1992. The
main body of the
prominence erupted around 21 UT. Shortly before the eruption, a large
soft X-ray jet was
observed near the southern leg of the prominence, around 18:30 UT.
An
increase of the
temperature was observed around the "root" of the jet in early stage of
the jet formation.
This suggests that the jet was generated by the magnetic reconnection
process initiated
by an emerging-flux region. The jet expanded with the speed of about 350
km/sec.
After the development of the jet, the observed temperature was lower and
the emission measure was
higher than those of the surrounding region. The kinetic energy of the
jet is estimated to be
about $5 \times 10^{28}$ erg. This value is comparable to those of
microflares.
Since the prominence
started to erupt immediately after the appearance of the jet, it is
suggested that the emerging
flux taking place near the southern leg of the prominence triggered the
prominence eruption.
In the course of eruption of the prominence with the speed of 30-50
km/sec, very complicated
loop structures were observed by Yohkoh SXT; helical loops surrounding
the prominence and
smooth loops passing through the center of the prominence.
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ABSTRACT.