Search Publications
A Search for Infrared Emission from Core-collapse Supernovae at the Transitional Phase
Onaka, Takashi; Arimatsu, Ko; Matsuhara, Hideo +7 more
Most of the observational studies of supernova (SN) explosions are limited to early phases (<a few years after the explosion) of extragalactic SNe and observations of SN remnants (>100 yr) in our Galaxy or very nearby galaxies. SNe at the epoch between these two, which we call the "transitional" phase, have not been explored in detail except…
Observations of the Interaction of Acoustic Waves and Small-scale Magnetic Fields in a Quiet Sun
Kariyappa, R.; Chitta, Lakshmi Pradeep; Jefferies, Stuart M. +1 more
The effect of the magnetic field on photospheric intensity and velocity oscillations at the sites of small-scale magnetic fields (SMFs) in a quiet Sun near the solar disk center is studied. We use observations made by the G-band filter in the Solar Optical Telescope on board Hinode for intensity oscillations; Doppler velocity, magnetic field, and …
On the Detectability of a Predicted Mesolensing Event Associated with the High Proper Motion Star VB 10
Lépine, Sébastien; DiStefano, Rosanne
Extrapolation of the astrometric motion of the nearby low-mass star VB 10 indicates that sometime in late 2011 December or during the first 2-3 months of 2012, the star will make a close approach to a background point source. Based on astrometric uncertainties, we estimate a 1 in 2 chance that the distance of closest approach ρmin will …
Analysis and Modeling of Two Flare Loops Observed by AIA and EIS
Ding, M. D.; Li, Y.; Qiu, J.
We analyze and model an M1.0 flare observed by SDO/AIA and Hinode/EIS to investigate how flare loops are heated and evolve subsequently. The flare is composed of two distinctive loop systems observed in extreme ultraviolet (EUV) images. The UV 1600 Å emission at the feet of these loops exhibits a rapid rise, followed by enhanced emission in differ…
The Absence of Cold Dust around Warm Debris Disk Star HD 15407A
Onaka, Takashi; Takita, Satoshi; Fukagawa, Misato +5 more
We report Herschel and AKARI photometric observations at far-infrared (FIR) wavelengths of the debris disk around the F3V star HD 15407A, in which the presence of an extremely large amount of warm dust (~500-600 K) has been suggested by mid-infrared (MIR) photometry and spectroscopy. The observed flux densities of the debris disk at 60-160 µ…
Solar Polar X-Ray Jets and Multiple Bright Points: Evidence for Sympathetic Activity
Romoli, Marco; Sterling, Alphonse C.; Pucci, Stefano +1 more
We present an analysis of X-ray bright points (BPs) and X-ray jets observed by Hinode/X-Ray Telescope on 2007 November 2-4, within the solar northern polar coronal hole. After selecting small subregions that include several BPs, we followed their brightness evolution over a time interval of a few hours, when several jets were observed. We find tha…
Low Ionization State Plasma in Coronal Mass Ejections
Raymond, John C.; Lee, Jin-Yi
The Ultraviolet Coronagraph Spectrometer (UVCS) on board the Solar and Heliospheric Observatory often observes low ionization state coronal mass ejection (CME) plasma at ultraviolet wavelengths. The CME plasmas are often detected in O VI (3 × 105 K), C III (8 × 104 K), Lyα, and Lyβ, with the low ionization plasma confined to …
Magnetic Flux Density Measured in Fast and Slow Solar Wind Streams
Balogh, A.; Erdős, G.
The radial component of the heliospheric magnetic field vector is used to estimate the open magnetic flux density of the Sun. This parameter has been calculated using observations from the Ulysses mission that covered heliolatitudes from 80°S to 80°N, from 1990 to 2009 and distances from 1 to 5.4 AU, the Advanced Composition Explorer mission at 1 …
Deflections of Fast Coronal Mass Ejections and the Properties of Associated Solar Energetic Particle Events
Gopalswamy, N.; Kahler, S. W.; Akiyama, S.
The onset times and peak intensities of solar energetic particle (SEP) events at Earth have long been thought to be influenced by the open magnetic fields of coronal holes (CHs). The original idea was that a CH lying between the solar SEP source region and the magnetic footpoint of the 1 AU observer would result in a delay in onset and/or a decrea…
Observation of High-speed Outflows in Coronal Loops Associated with Photospheric Magnetic Field Evolution
Liu, Y.; Su, J. T.; Liu, S. +2 more
Using SDO/AIA instruments, we provide an EUV observation of two adjacent loop strands (Loops 1 and 2) with one side of their footpoints rooted in the boundaries of active region (AR) NOAA 11158 and the other side in the quiet-Sun regions. The AR footpoints of Loop 1 were located in monopolar magnetic areas and those of Loop 2 in mixed polar areas …