Publications (13)
A Catalog of Bipolar Active Regions Violating the Hale Polarity Law, 1989-2018
A. Zhukova, A. Khlystova, V. Abramenko +1
There is no list of bipolar active regions (ARs) with reverse polarity (anti-Hale regions), although statistical investigations of such ARs (bearing the imprint of deep subphotosph…
Solar small-scale dynamo and polarity of sunspot groups
D. Sokoloff, A. Khlystova, V. Abramenko
In order to clarify a possible role of small-scale dynamo in formation of solar magnetic field, we suggest an observational test for small-scale dynamo action based on statistics o…
Oscillatory behavior in the quiet Sun observed with the New Solar Telescope
A. ~Andic, P. R. Goode, J. Chae +4
Surface photometry of the quiet Sun has achieved an angular resolution of with the New Solar Telescope at Big Bear Solar Observatory revealing that a disproportionate fracti…
Topological changes of the photospheric magnetic field inside active regions: a prelude to flares
L. Sorriso-Valvo, V. Carbone, V. Abramenko +5
The observations of magnetic field variations as a signature of flaring activity is one of the main goal in solar physics. Some efforts in the past give apparently no unambiguous o…
High Resolution Observations of Chromospheric Jets in Sunspot Umbra
V. Yurchyshyn, V. Abramenko, S. Kosovichev +1
Recent observations of sunspot's umbra suggested that it may be finely structured at a sub-arcsecond scale representing a mix of hot and cool plasma elements. In this study we repo…
Transverse Motions of Chromospheric Type II Spicules Observed by the New Solar Telescope
V. Yurchyshyn, A. Kilcik, V. Abramenko
Using high resolution off-band \ha\ data from the New Solar Telescope and Morlet wavelet analysis technique, we analyzed transverse motions of type II spicules observed near the No…
Response of Granulation to Small Scale Bright Features in the Quiet Sun
Aleksandra Andic, J. Chae, K. Ahn +4
We detected 2.8 bright points (BPs) per Mm in the Quiet Sun (QS) with the New Solar Telescope (NST) at Big Bear Solar Observatory; using the TiO 705.68 nm spectral line, at an…
Low-Latitude Coronal Holes at the Minimum of the 23rd Solar Cycle
V. Abramenko, V. Yurchyshyn, J. Linker +3
Low and mid-latitude coronal holes (CHs) observed on the Sun during the current solar activity minimum (from September 21, 2006, Carrington rotation (CR) 2048, until June 26, 2009…
Synthetic solar cycle for active regions violating the Hale's polarity law
A. Zhukova, A. Khlystova, V. Abramenko +1
Long observational series for bipolar active regions (ARs) provide significant information about the mutual transformation of the poloidal and toroidal components of the global sol…
Properties of Umbral Dots as Measured from the New Solar Telescope Data and MHD Simulations
A. Kilcik, V. B. Yurchyshyn, M. Rempel +5
We studied bright umbral dots (UDs) detected in a moderate size sunspot and compared their statistical properties to recent MHD models. The study is based on high resolution data r…
Time Distributions of Large and Small Sunspot Groups Over Four Solar Cycles
A. Kilcik, V. B. Yurchyshyn, V. Abramenko +4
Here we analyze solar activity by focusing on time variations of the number of sunspot groups (SGs) as a function of their modified Zurich class. We analyzed data for solar cycles…
Small Scale Field Emergence and Its Impact on Photospheric Granulation
V. Yurchyshyn, K. Ahn, V. Abramenko +2
We used photospheric intensity images and magnetic field measurements from the New Solar Telescope in Big Bear and Helioseismic Magnetic Imager on board Solar Dynamics Observatory…
Maximum Coronal Mass Ejection Speed as an Indicator of Solar and Geomagnetic Activities
A. Kilcik, V. B. Yurchyshyn, V. Abramenko +4
We investigate the relationship between the monthly averaged maximal speeds of coronal mass ejections (CMEs), international sunspot number (ISSN), and the geomagnetic Dst and Ap in…