214 citations · 548 across the 17 of their papers we have counts for
17 papers
Relationship between magnetic field properties and statistical flow using numerical simulation and magnetic feature tracking on solar photosphere
K. Takahata, H. Hotta, Y. Iida +1
We perform radiative magnetohydrodynamic calculations for the solar quiet region to investigate the dependence of statistical flow on magnetic properties and the three-dimensional…
Average radial structures of gas convection in the solar granulation
T. Oba, Y. Iida, T. Shimizu
Gas convection is observed in the solar photosphere as the granulation, i.e., having highly time-dependent cellular patterns, consisting of numerous bright cells called granules an…
Statistical Relation between Solar Flares and Coronal Mass Ejections with Respect to Sigmoidal Structures in Active Regions
Y. Kawabata, Y. Iida, T. Doi +3
Statistical dependencies among features of coronal mass ejections (CMEs), solar flares, and sigmoidal structures in soft-X-ray images were investigated. We applied analysis methods…
The small-scale structure of photospheric convection retrieved by a deconvolution technique applied to Hinode/SP data
T. Oba, T. L. Riethmüller, S. K. Solanki +3
Solar granules are bright patterns surrounded by dark channels called intergranular lanes in the solar photosphere and are a manifestation of overshooting convection. Observational…
Height-dependent velocity structure of photospheric convection in granules and intergranular lanes with Hinode/SOT
T. Oba, Y. Iida, T. Shimizu
The solar photosphere is the visible surface of the Sun, where many bright granules, surrounded by narrow dark intergranular lanes, are observed everywhere. The granular pattern is…
Detection of Flux Emergence, Splitting, Merging, and Cancellation of Network Fields. II Apparent Unipolar Flux Change and Cancellation
Y. Iida, H. Hagenaar, T. Yokoyama
In this second paper in the series, we investigate occurrence frequencies of apparent unipolar processes, cancellation, and emergence of patch structures in quiet regions. Apparent…
Photospheric Flow Field Related to the Evolution of the Sun's Polar Magnetic Patches Observed by Hinode SOT
Anjali John Kaithakkal, Y. Suematsu, M. Kubo +3
We investigated the role of photospheric plasma motions in the formation and evolution of polar magnetic patches using time-sequence observations with high spatial resolution. The…
Comparison between Hinode/SOT and SDO/HMI, AIA Data for the Study of the Solar Flare Trigger Process
Yumi Bamba, Kanya Kusano, Shinsuke Imada +1
To elucidate the flare trigger mechanism, we have analyzed several flare events which were observed by Hinode/Solar Optical Telescope (SOT), in our previous study. Because of the l…
Formation of a Flare-Productive Active Region: Observation and Numerical Simulation of NOAA AR 11158
S. Toriumi, Y. Iida, K. Kusano +2
We present a comparison of the Solar Dynamics Observatory (SDO) analysis of NOAA Active Region (AR) 11158 and numerical simulations of flux-tube emergence, aiming to investigate th…
Magnetic Systems Triggering the M6.6-class Solar Flare in NOAA Active Region 11158
Shin Toriumi, Yusuke Iida, Yumi Bamba +3
We report a detailed event analysis on the M6.6-class flare in the active region (AR) NOAA 11158 on 2011 February 13. AR 11158, which consisted of two major emerging bipoles, showe…
Surface Magnetic Flux Maintenance In Quiet Sun
Y. Iida
We investigate surface processes of magnetic patches, namely merging, splitting, emergence, and cancellation, by using an auto-detection technique. We find that merging and splitti…
Magnetic Field Structures Triggering Solar Flares and Coronal Mass Ejections
K. Kusano, Y. Bamba, T. T. Yamamoto +3
Solar flares and coronal mass ejections (CMEs), the most catastrophic eruptions in our solar system, have been known to affect terrestrial environments and infrastructure. However,…
Detection of flux emergence, splitting, merging, and cancellation of network field. I Splitting and Merging
Y. Iida, H. Hagenaar, T. Yokoyama
Frequencies of magnetic patch processes on supergranule boundary, namely flux emergence, splitting, merging, and cancellation, are investigated through an automatic detection. We u…
Estimation of turbulent diffusivity with direct numerical simulation of stellar convection
H. Hotta, Y. Iida, T. Yokoyama
We investigate the value of horizontal turbulent diffusivity η by numerical calculation of thermal convection. In this study, we introduce a new method whereby the turbulent diffus…
Numerical Calculation of Convection with Reduced Speed of Sound Technique
H. Hotta, M. Rempel, T. Yokoyama +2
Context. The anelastic approximation is often adopted in numerical calculation with low Mach number, such as stellar internal convection. This approximation requires frequent globa…
Detection of flux emergence, splitting, merging, and cancellation in quiet Sun
Y. Iida, H. Hagenaar, T. Yokoyama
We investigate the frequency of magnetic activities, namely flux emergence, splitting, merging, and cancellation, through an automatic detection in order to understand the generati…
Magnetic Fields and Velocity Structures around a Cancellation Site
Y. Iida, T. Yokoyama, K. Ichimoto
A cancellation is thought to be a basic process of the photospheric magnetic field and plays an important role in magnetic flux budget and in various solar activities. There are tw…