Search Publications
High energy neutron and pion-decay gamma-ray emissions from solar flares
Chupp, Edward L.; Ryan, James M.
Solar flare gamma-ray emissions from energetic ions and electrons have been detected and measured to GeV energies since 1980. In addition, neutrons produced in solar flares with 100 MeV to GeV energies have been observed at the Earth. These emissions are produced by the highest energy ions and electrons accelerated at the Sun and they provide our …
The causality between the rapid rotation of a sunspot and an X3.4 flare
Yan, Xiao-Li; Qu, Zhong-Quan; Xu, Cheng-Lin +2 more
Using multi-wavelength data of Hinode, the rapid rotation of a sunspot in active region NOAA 10930 is studied in detail. We found extraordinary counterclockwise rotation of the sunspot with positive polarity before an X3.4 flare. From a series of vector magnetograms, it is found that magnetic force lines are highly sheared along the neutral line a…
Study of white-light flares observed by Hinode
Wang, Hai-Min
White-light flares are considered to be the most energetic flaring events that are observable in the optical broad-band continuum of the solar spectrum. They have not been commonly observed. Observations of white-light flares with sub-arcsecond resolution have been very rare. The continuous high resolution observations of Hinode provide a unique o…
Magnetic non-potentiality on the quiet Sun and the filigree
Zhao, Meng; Wang, Jing-Xiu; Jin, Chun-Lan +1 more
From the observed vector magnetic fields by the Solar Optical Telescope/Spectro-Polarimeter aboard the satellite Hinode, we have examined whether or not the quiet Sun magnetic fields are non-potential, and how the G-band filigrees and Ca II network bright points (NBPs) are associated with the magnetic non-potentiality. A sizable quiet region in th…
Interaction between granulation and small-scale magnetic flux observed by Hinode
Zhang, Jun; Jin, Chun-Lan; Yang, Shu-Hong
With the polarimetric observations obtained by the Spectro-Polarimeter on board Hinode, we study the relationship between granular development and magnetic field evolution in the quiet Sun. Six typical cases are displayed to exhibit interaction between granules and magnetic elements, and we have obtained the following results. (1) A granule develo…
Cassini-Huygens results on Titan's surface
Coustenis, Athena; Hirtzig, Mathieu
Our understanding of Titan, Saturn's largest satellite, has recently been considerably enhanced, thanks to the Cassini-Huygens mission. Since the Saturn Orbit Injection in July 2004, the probe has been harvesting new insights of the Kronian system. In particular, this mission orchestrated a climax on January 14, 2005 with the descent of the Huygen…
Orbital X-ray modulation study of three supergiant HMXBs
Paul, Biswajit; Jain, Chetana; Dutta, Anjan
We present the orbital X-ray modulation study of three high mass X-ray binary systems, IGR J18027-2016, IGR J18483-0311 and IGR J16318-4848, using data obtained with RXTE-ASM, Swift-BAT and INTEGRAL-ISGRI. Using the long term light curves of the eclipsing HMXB IGR J18027-2016, obtained with Swift-BAT in the energy range 15-50 keV and INTEGRAL-ISGR…
Classification of extremely red objects in the Hubble Ultra Deep Field
Kong, Xu; Wang, Min; Fang, Guan-Wen
We present a quantitative study of the classification of Extremely Red Objects (EROs). The analysis is based on the multi-band spatial- and ground-based observations (HST/ACS-BViz, HST/NICMOS- JH, VLT-JHK) in the Hubble Ultra Deep Field (UDF). Overatotal sky area of 5.50 arcmin2 in the UDF, we select 24 EROs with the color criterion (i …
Measurements of spectral lines observed with Hinode/EIS as implications for coronal heating
Li, Ying; Ding, Ming-De
We have measured the line widths and nonthermal velocities in 12 solar regions using high resolution EUV data taken by Hinode/EIS. We find that there exists a positive correlation between the intensity and nonthermal velocity for the Fe XII emission line as well as some other lines. The correlation coefficients decrease from the disk center to the…
Two types of dynamic cool coronal structures observed with STEREO and Hinode
Zhang, Jun; Li, Le-Ping
Solar coronal loops show significant plasma motions during their formation and eruption stages. Dynamic cool coronal structures, on the other hand, are often observed to propagate along coronal loops. We report on the discovery of two types of dynamic cool coronal structures, and characterize their fundamental properties. Using the EUV 304 Å image…