Soft X-Ray Coronal Holes Observed by the Yohkoh SXT.
نویسندگان
چکیده
منابع مشابه
Characteristics of Anemone Active Regions Appearing in Coronal Holes Observed with Yohkoh Soft X-ray Telescope
Coronal structure of active regions appearing in coronal holes is studied by using the data obtained with the Soft X-Ray Telescope (SXT) aboard Yohkoh from 1991 November to 1993 March. The following characteristics are found; Many of active regions appearing in coronal holes show a structure that looks like a “sea-anemone”. Such active regions are called anemone ARs. About oneforth of all activ...
متن کاملYohkoh Sxt Observations of X-ray “dimming” Associated with a Halo Coronal Mass Ejection
A sudden depletion or intensity “dimming” of the X-ray corona sometimes accompanies a solar eruptive flare or coronal mass ejection (CME). We have identified a dimming that occurred just prior to a “halo” CME, observed on 1997 April 7 using the Soft X-ray Telescope (SXT) on Yohkoh. Halo CMEs are prime candidates for “space weather” effects. The dimming occurred in compact regions near a flare o...
متن کاملStatistical Study of Solar X-Ray Jets Observed with the Yohkoh Soft X-Ray Telescope
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 (microflaressubflares) at their footpoints. 2) The lengths lie in the range of a few x 10-4 x 10 km. 3...
متن کاملDetermination of the length of coronal loops from the decay of X-ray flares I. Solar flares observed with Yohkoh SXT
We show how to estimate the size of spatially unresolved solar and stellar coronal flaring regions from the X-ray light curve and time-resolved temperature and emission measure values during the flare decay. Bymeans of extensive hydrodynamic modeling of decaying flaring loops, we propose and test a relationship between the decay time of the light curve in the band of a specific instrument and t...
متن کاملX ? Ray Photon Spectroscopy with the Yohkoh Soft X ? Ray Telescope
Individual X ? ray photons in the keV energy range produce hundreds of photoelectrons in a single pixel of a CCD array detector. The number of photoelectrons produced is a linear function of the photon energy, allowing the measurement of spectral information with an imaging detector system. The Yohkoh Soft X ? ray Telescope uses a CCD in an integrating mode and makes temperature estimates from ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of geomagnetism and geoelectricity
سال: 1995
ISSN: 0022-1392
DOI: 10.5636/jgg.47.1063