Results 41 to 50 of about 2,960 (140)

New Radical-Cation Salts Based on the TMTTF and TMTSF Donors with Iron and Chromium Bis(Dicarbollide) Complexes: Synthesis, Structure, Properties

Crystals, 2021
New radical-cation salts based on tetramethyltetrathiafulvalene (TMTTF) and tetramethyltetraselenefulvalene (TMsTSF) with metallacarborane anions (TMTTF)[3,3′-Cr(1,2-C2B9H11)2], (TMTTF)[3,3′-Fe(1,2-C2B9H11)2], and (TMTSF)2[3,3′-Cr(1,2-C2B9H11)2] were ...
Denis M. Chudak, Olga N. Kazheva, Irina D. Kosenko, Gennady V. Shilov, Igor B. Sivaev, Georgy G. Abashev, Elena V. Shklyaeva, Lev I. Buravov, Dmitry N. Pevtsov, Tatiana N. Starodub, Vladimir I. Bregadze, Oleg A. Dyachenko   +11 more
doaj   +1 more source

Global Twist of Sunspot Magnetic Fields Obtained from High Resolution Vector Magnetograms

, 2009
The presence of fine structures in the sunspot vector magnetic fields has been confirmed from Hinode as well as other earlier observations. We studied 43 sunspots based on the data sets taken from ASP/DLSP, Hinode (SOT/SP) and SVM (USO).
Bao, Choudhuri, Cuperman, Elmore, Hagino, Hagino, Hahn, Harvey, Ichimoto, K. Sankarasubramanian, Longcope, Nandy, P. Venkatakrishnan, Parker, Pevtsov, Pevtsov, Pevtsov, Rachkowsky, Sakurai, Sakurai, Sanjiv Kumar Tiwari, Sankarasubramanian, Sankarasubramanian, Severnyi, Su, Tiwari, Tiwari, Tiwari, Unno   +28 more
core   +1 more source

The Faraday Effect Tracker of Coronal and Heliospheric Structures (FETCH) instrument

Frontiers in Astronomy and Space Sciences, 2023
There continue to be open questions regarding the solar wind and coronal mass ejections (CMEs). For example: how do magnetic fields within CMEs and corotating/stream interaction regions (CIRs/SIRs) evolve in the inner heliosphere?
Elizabeth A. Jensen, Nat Gopalswamy, Lynn B. Wilson, Lan K. Jian, Shing F. Fung, Teresa Nieves-Chinchilla, Marta Shelton, Lihua Li, Manohar Deshpande, Lloyd Purves, Joseph Lazio, Ward B. Manchester, Brian E. Wood, Jason E. Kooi, David B. Wexler, Stuart Bale, Alexei Pevtsov, Bernard V. Jackson, Kenny N. Kenny   +18 more
doaj   +1 more source

Bimodal Distribution of Magnetic Fields and Areas of Sunspots

, 2013
We applied automatic identification of sunspot umbrae and penumbrae to daily observations from the Helioseismic Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) to study their magnetic flux (B) and area (A).
Pevtsov, Alexei A., Tlatov, Andrey G.
core   +1 more source

Long-term Variations in the Intensity of Plages and Networks as Observed in Kodaikanal Ca-K Digitized Data

, 2017
In our previous article (Priyal et al. in Solar Phys. 289, 127, 2014) we have discussed the details of observations and methodology adopted to analyze the Ca-K spectroheliograms obtained at the Kodaikanal Observatory (KO) to study the variation of Ca-K ...
Belur, Ravindra, Priyal, Muthu, Rathina, Somasundaram Kameshwaran, Singh, Jagdev   +3 more
core   +1 more source

Formation and eruption of sigmoidal structure from a weak field region of NOAA 11942 [PDF]

, 2019
Using observations from Solar Dynamics Observatory, we studied an interesting example of a sigmoid formation and eruption from small-scale flux canceling regions of active region (AR) 11942.
Doddamani, V. H., Ravindra, B., Vasantharaju, N., Vemareddy, P.   +3 more
core   +2 more sources

Evolution of magnetic fields and energetics of flares in active region 8210 [PDF]

, 2006
To better understand eruptive events in the solar corona, we combine sequences of multi-wavelength observations and modelling of the coronal magnetic field of NOAA AR 8210, a highly flare-productive active region.
Canfield, Richard C., Regnier, Stephane
core   +1 more source

Solar Sources of Interplanetary Magnetic Clouds Leading to Helicity Prediction

Space Weather, Volume 16, Issue 11, Page 1668-1685, November 2018., 2018
Abstract This study identifies the solar origins of magnetic clouds that are observed at 1 AU and predicts the helical handedness of these clouds from the solar surface magnetic fields. We started with the magnetic clouds listed by the Magnetic Field Investigation (MFI) team supporting NASA's Wind spacecraft in what is known as the MFI table and worked
Roger K. Ulrich, Pete Riley, T. Tran
wiley   +1 more source

The Solar Activity Monitor Network – SAMNet

Journal of Space Weather and Space Climate, 2022
The Solar Activity Magnetic Monitor (SAMM) Network (SAMNet) is a future UK-led international network of ground-based solar telescope stations. SAMNet, at its full capacity, will continuously monitor the Sun’s intensity, magnetic, and Doppler velocity ...
Erdélyi Robertus, Korsós Marianna B., Huang Xin, Yang Yong, Pizzey Danielle, Wrathmall Steven A., Hughes Ifan G., Dyer Martin J., Dhillon Vikram S., Belucz Bernadett, Brajša Roman, Chatterjee Piyali, Cheng Xuewu, Deng Yuanyong, Domínguez Santiago Vargas, Joya Raúl, Gömöry Peter, Gyenge Norbert G., Hanslmeier Arnold, Kucera Ales, Kuridze David, Li Faquan, Liu Zhong, Xu Long, Mathioudakis Mihalis, Matthews Sarah, McAteer James R.T., Pevtsov Alexei A., Pötzi Werner, Romano Paolo, Shen Jinhua, Temesváry János, Tlatov Andrey G., Triana Charles, Utz Dominik, Veronig Astrid M., Wang Yuming, Yan Yihua, Zaqarashvili Teimuraz, Zuccarello Francesca   +39 more
doaj   +1 more source

Effect of Polarimetric Noise on the Estimation of Twist and Magnetic Energy of Force-Free Fields

, 2009
The force-free parameter $\alpha$, also known as helicity parameter or twist parameter, bears the same sign as the magnetic helicity under some restrictive conditions.
Ai, Arnaud, Bao, Burnette, Chandrasekhar, Hagino, Hagino, Jayant Joshi, Jones, Keller, Lites, Longcope, Low, Low, Makita, Martin, Martin, P. Venkatakrishnan, Parker, Pevtsov, Pevtsov, Pevtsov, Pevtsov, Rachkowsky, Rust, S'anchez Almeida, Sakurai, Sanjay Gosain, Sanjiv Kumar Tiwari, Sankarasubramanian, Socas-Navarro, Solanki, Staude, Stenflo, Stepanov, Unno   +35 more
core   +1 more source