199?PASJ...48?.123?

SAO/NASA ADS Astronomy Abstract Service

Title:
155 Micron Continuum Emission from the Galactic Plane near L = 50 Degrees Observed by IRTS

Authors:
Okumura, Ken'ichi; Hiromoto, Norihisa; Okuda, Haruyuki; Shibai, Hiroshi; Nakagawa, Takao; Makiuti, Sin'itirou; Matsuhara, Hideo

Affiliation:
AA(Communications Research Laboratory, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184), AB(Communications Research Laboratory, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184), AC(Communications Research Laboratory, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184), AD(Communications Research Laboratory, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184), AE(Communications Research Laboratory, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184), AF(The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229), AG(Department of Physics, School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01)

Publication:
Publ. of the Astronomical Society of Japan, v.48, p.L123-L126. (PASJ Homepage)

Publication Date:
12/1996

Origin:
PASJ

PASJ Keywords:
GALAXIES: MILKY WAY, INFRARED: SPECTRA, INTERSTELLAR: DUST, INTERSTELLAR: MEDIUM, SPACECRAFT

Bibliographic Code:
1996PASJ...48L.123O

Abstract

The 155 mu m continuum emission from the galactic plane around l = 50(deg) was observed with an 8'times13 ' beam by the Far-Infrared Line Mapper (FILM) aboard the Infrared Telescope in Space (IRTS). The observed map noticeably resembles the IRAS 100 mu m map. The dust temperature calculated from their flux ratio is almost constant (16--18 K) throughout the observed area, except for the HII regions. The dust temperatures in the HII regions are significantly higher than in the surrounding region; there is a clear boundary between the cold and hot regions. The observed uniformity of the dust temperature, except for in the HII regions, implies that the strength of the average interstellar radiation field (ISRF) along each line of sight is almost constant (i.e., varies by less than a factor of 2) in the observed region of the galactic plane.

Title:		Statistical Study of Solar X-Ray Jets Observed with the YOHKOH Soft X-Ray Telescope
Authors:		Shimojo, Masumi; Hashimoto, Shizuyo; Shibata, Kazunari; Hirayama, Tadashi; Hudson, Hugh S.; Acton, Loren W.
Affiliation:		AA(Department of Physics, School of Science, Tokai University, Hiratsuka, Kanagawa 259-12), AB(Department of Physics, School of Science, Tokai University, Hiratsuka, Kanagawa 259-12), AC(Department of Physics, School of Science, Tokai University, Hiratsuka, Kanagawa 259-12), AD(National Astronomical Observatory, Mitaka, Tokyo 181), AE(Institute for Astronomy, University of Hawaii 2680 Woodlawn Drive, Honolulu, HI, U.S.A.), AF(Montana State University, Bozeman, MT, U.S.A.)
Publication:		Publ. of the Astronomical Society of Japan, v.48, p.123-136. (PASJ Homepage)
Publication Date:		02/1996
Origin:		PASJ
PASJ Keywords:		SPACECRAFT, SUN: ACTIVITY, SUN: JETS, SUN: X-RAYS
Bibliographic Code:		1996PASJ...48..123S

Abstract

We have found 100 X-ray jets in the database of full Sun images taken with the Soft X-ray Telescope (SXT) aboard Yohkoh during the period from 1991 November through 1992 April. A statistical study for these jets results in the following characteristics: 1)\ Most are associated with small flares (microflares--subflares) at their footpoints. 2)\ The lengths lie in the range of a few times 10(4) --4 times 10(5) km. 3)\ The widths are 5 times 10(3) --10(5) km. 4)\ The apparent velocities are 10--1000 km s(-1) with an average velocity of about 200 km s(-1) . 5)\ The lifetime of the jet extends to ~ 10 hours and the distribution of the observed lifetime is a power law with an index of ~ 1.2. 6)\ 76% of the jets show constant or converging shapes; the width of the jet is constant or decreases with distance from the footpoint. The converging type tends to be generated with an energetic footpoint event and the constant type by a wide energy range of the footpoint event. 7)\ Many jets ( ~ 68%) appear in or near to active regions (AR). Among the jets ejected from bright-point like features in ARs, most ( ~ 86%) are observed to the west of the active region. 8)\ 27% of the jets show a gap ( > 10(4) km) between the exact footpoint of the jet and the brightest part of the associated flare. 9)\ The X-ray intensity distribution along an X-ray jet often shows an exponential decrease with distance from the footpoint. This exponential intensity distribution holds from the early phase to the decay phase.

Title:		155 Micron Continuum Emission from the Galactic Plane near L = 50 Degrees Observed by IRTS
Authors:		Okumura, Ken'ichi; Hiromoto, Norihisa; Okuda, Haruyuki; Shibai, Hiroshi; Nakagawa, Takao; Makiuti, Sin'itirou; Matsuhara, Hideo
Affiliation:		AA(Communications Research Laboratory, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184), AB(Communications Research Laboratory, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184), AC(Communications Research Laboratory, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184), AD(Communications Research Laboratory, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184), AE(Communications Research Laboratory, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184), AF(The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229), AG(Department of Physics, School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01)
Publication:		Publ. of the Astronomical Society of Japan, v.48, p.L123-L126. (PASJ Homepage)
Publication Date:		12/1996
Origin:		PASJ
PASJ Keywords:		GALAXIES: MILKY WAY, INFRARED: SPECTRA, INTERSTELLAR: DUST, INTERSTELLAR: MEDIUM, SPACECRAFT
Bibliographic Code:		1996PASJ...48L.123O