Search Publications
Data Archive of the Hinode Mission
Tarbell, T. D.; Harra, L. K.; Shimojo, M. +2 more
All of the Hinode telemetry data are to be reformatted and archived in the DARTS system at ISAS and mirrored to data centers around the word. The archived data are distributed to users through the Internet. This paper gives an overview of the files in the archive, including the file formats. All formats are portable and have heritage from the prev…
Prominences on the Limb: Diagnostics with UV EUV Lines and the Soft X-Ray Continuum
Heinzel, P.; Anzer, U.; Fárnik, F.
In this paper we discuss the two mechanisms by which solar prominences on the limb can manifest themselves when observed in coronal UV - EUV lines and in the soft X-ray continuum. These mechanisms are the absorption in the resonance continua of hydrogen and helium on one hand and the reduction of the emissivity in a part of the coronal volume occu…
From Gigahertz to Millihertz: A Multiwavelength Study of the Acoustically Active 14 August 2004 M7.4 Solar Flare
Moradi, H.; Cally, P. S.; Lindsey, C. +3 more
We carried out an electromagnetic acoustic analysis of the solar flare of 14 August 2004 in active region AR10656 from the radio to the hard X-ray spectrum. The flare was a GOES soft X-ray class M7.4 and produced a detectable sun quake, confirming earlier inferences that relatively low energy flares may be able to generate sun quakes. We introduce…
Two-Dimensional Spectroscopy of Photospheric Shear Flows in a Small δ Spot
Yurchyshyn, V.; Tritschler, A.; Denker, C. +1 more
In recent high-resolution observations of complex active regions, long-lasting and well-defined regions of strong flows were identified in major flares and associated with bright kernels of visible, near-infrared, and X-ray radiation. These flows, which occurred in the proximity of the magnetic neutral line, significantly contributed to the genera…
Decametric N Burst: A Consequence of the Interaction of Two Coronal Mass Ejections
Mandrini, C. H.; van Driel-Gesztelyi, L.; Culhane, J. L. +5 more
Radio emissions of electron beams in the solar corona and interplanetary space are tracers of the underlying magnetic configuration and of its evolution. We analyse radio observations from the Culgoora and WIND/WAVES spectrographs, in combination with SOHO/LASCO and SOHO/MDI data, to understand the origin of a type N burst originating from NOAA AR…
Hα Dimming Associated With the Eruption of a Coronal Sigmoid in the Quiet Sun
Yang, Liheng; Shen, Yuandeng; Chen, Huadong +2 more
We report on the occurrence of Hα dimming associated with a sigmoid eruption in a quiet-sun region on 14 August 2001. The coronal sigmoid in soft X-ray images from the Yohkoh Soft X-ray Telescope was located over an Hα filament channel. Its eruption was accompanied by a flare of GOES X-ray class C2.3 and possibly associated with a halo coronal mas…
A New Explanation for the Origin of Trans-equatorial Loops based on a Dynamo Model
Wang, Jingxiu; Jiang, Jie; Choudhuri, Arnab Rai
Trans-equatorial loops (TLs) are one of the distinct magnetic structures in the solar corona and have a close relationship to solar activity. We present a systematic study of the origin of TLs linking with the Babcock - Leighton dynamo process based on the model of Chatterjee, Nandy, and Choudhuri (Astron. Astrophys.427, 1019, 2004). We propose th…
Helicity Patterns of the Active Regions Connected by Transequatorial Loops
Zhang, Hongqi; Chen, Jie; Bao, Shudong
Using photospheric vector magnetograms of the Huairou Solar Observing Station and coronal X-ray images from the Yohkoh Soft X-Ray Telescope, we calculate the helicity patterns of 43 pairs of active regions and the chirality of 50 pairs of opposite magnetic polarity regions that are connected by transequatorial loops (TLs). To make the results more…
Absorption in Burst Emission
Rucker, H. O.; Kaiser, M. L.; Lecacheux, A. +5 more
Here we report a radio burst in absorption at 9 - 30 MHz observed with the UTR-2 telescope. This event occurred on 19 August 2003 about 11:16 - 11:26 UT, against solar type IV/II emission background. It is the first event where absorption was observed below 30 MHz. The absorption region, comparable with the solar radius size, traveled a long dista…
Spatial Characterization of a Flare Using Radio Observations and Magnetic Field Topology
Mandrini, C. H.; Cristiani, G.; Rovira, M. G. +4 more
Using magnetograms, EUV and Hα images, Owens Valley Solar Array microwave observations, and 212-GHz flux density derived from the Solar Submillimeter Telescope data, we determine the spatial characteristics of the 1B/M6.9 flare that occurred on November 28, 2001, starting at 16:26 UT in active region (AR) NOAA 9715. This flare is associated with a…