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The He II Lines in the Lyman Series Profiles of Solar Prominences
Vial, J. -C.; Ajabshirizadeh, A.; Ebadi, H.
The hydrogen and helium lines are the most prominent lines in the solar prominences spectra. Observations with the SUMER spectrometer onboard SOHO showed that there are weak lines in the blue wings of the Lyman series which affect their profiles. They were all identified as He II lines in the Lyman series wings, except for the Lα line whose profil…
Periodicity of Twisting Motions in Sunspot Penumbral Filaments
Cao, Wenda; Ning, Zongjun; Goode, Philip R.
We study the periodicity of twisting motions in sunspot penumbral filaments, which were recently discovered from space (Hinode) and ground-based (SST) observations. A sunspot was well observed for 97 minutes by Hinode/SOT in the G-band (4305 Å) on 12 November 2006. By the use of the time - space gradient applied to intensity space - time plots, tw…
Statistical Analysis of Decimetric Radio Bursts, Flares, and Coronal Mass Ejections
Michalek, G.; Puchowska, K.; Rams, A.
A statistical analysis of decimetric radio bursts (RBs), X-ray flares and coronal mass ejections (CMEs) is carried out. We consider all radio bursts recorded by the Cracow Solar Radio Telescope from the beginning of 1996 until the end of 2004. It is found that the decimetric radio bursts are associated and strongly correlated with X-ray flares. Co…
Spatial and Spectral Behaviors of Solar Flares Observed in Microwaves
Cao, Wenda; Ning, Zongjun
The spatial and spectral behaviors of two solar flares observed by the Nobeyama Radioheliograph (NoRH) on 24 August 2002 and 22 August 2005 are explored. They were observed with a single loop-top source and double footpoint sources at the beginning, then with looplike structures for the rest of the event. NoRH has high spatial and temporal resolut…
A Repository of Precision Flat Fields for High-Resolution MDI Continuum Data
Potts, H. E.; Diver, D. A.
We describe an archive of high-precision MDI flat fields that can be used to refine most MDI high-resolution continuum data. The archive consists of many flat-field images representing different time ranges over the full operating period of SOHO. The residual flat-field error on the standard level 1.5/1.8 calibrated continuum images represents a s…
Observational Study of a Peculiar Solar Limb Event Occurred on 11 January 2002
Li, Hui; You, Jianqi
On 11 January 2002, using the Multi-channel Infrared Solar Spectrograph (MISS) at the Purple Mountain Observatory (PMO), we obtained Hα, Ca II 8542 Å and He I 10 830 Å spectra and slit-jaw Hα images of a peculiar solar limb event. A close resemblance of its intensity to that of a small flare and the GOES X-ray flux indicates that it was an active …
Solar Wind Effects Associated with a Recurrent, High-Latitude Coronal Brightness Enhancement
Parker, Gary D.
During the descent of Ulysses following the 2001 solar north pole passage, the SOHO LASCO C2 telescope recorded a particularly strong sequence of recurrent polarization brightness (pB) features at latitudes of around 55°. As Ulysses passed overhead, solar rotation swept the interplanetary extensions of these persistent coronal structures over the …
The Solar Optical Telescope for the Hinode Mission: An Overview
Ichimoto, K.; Tsuneta, S.; Suematsu, Y. +22 more
The Solar Optical Telescope (SOT) aboard the Hinode satellite (formerly called Solar-B) consists of the Optical Telescope Assembly (OTA) and the Focal Plane Package (FPP). The OTA is a 50-cm diffraction-limited Gregorian telescope, and the FPP includes the narrowband filtergraph (NFI) and the broadband filtergraph (BFI), plus the Stokes Spectro-Po…
The Solar Optical Telescope of Solar-B ( Hinode): The Optical Telescope Assembly
Kubo, M.; Ichimoto, K.; Tsuneta, S. +18 more
The Solar Optical Telescope (SOT) aboard the Solar-B satellite (Hinode) is designed to perform high-precision photometric and polarimetric observations of the Sun in visible light spectra (388 - 668 nm) with a spatial resolution of 0.2 - 0.3 arcsec. The SOT consists of two optically separable components: the Optical Telescope Assembly (OTA), consi…
Polarization Calibration of the Solar Optical Telescope onboard Hinode
Ichimoto, K.; Tsuneta, S.; Suematsu, Y. +17 more
The Solar Optical Telescope (SOT) onboard Hinode aims to obtain vector magnetic fields on the Sun through precise spectropolarimetry of solar spectral lines with a spatial resolution of 0.2 - 0.3 arcsec. A photometric accuracy of 10−3 is achieved and, after the polarization calibration, any artificial polarization from crosstalk among S…