Results 61 to 70 of about 3,875 (223)

High-resolution observations of the solar photosphere, chromosphere, and transition region [PDF]

, 2020
NASA’s Interface Region Imaging Spectrograph (IRIS) provides high-resolution observations of the solar atmosphere through ultraviolet spectroscopy and imaging.
de Pontieu, B., Scharmer, G. B., Scharmer, G., Scharmer, Göran B.,, Sainz Dalda, A., Rouppe van der Voort, L. H. M., Kleint, L., M. M. Woods, B. De Pontieu, A. Sainz Dalda, Gošić, M., Henriques, V., S. Jafarzadeh, Skogsrud, H., Dalda, A. Sainz, G. Chintzoglou, J. Martínez-Sykora, Jafarzadeh, S., A. Popovas, L. H. M. Rouppe van der Voort, M. Szydlarski, G. B. Scharmer, M. Gošić, Szydlarski, M., Graham, D., Hansteen, V. H., Scullion, Eamon, de La Cruz Rodríguez, J., C. Quintero Noda, Carlsson, M., R. Timmons, van der Voort, L. H. M. Rouppe, Kohutova, P., Pereira, T., Hansteen, V., S. Bose, L. Kleint, G. J. M. Vissers, Noda, C. Quintero, Woods, M. M., J. de la Cruz Rodríguez, Zacharias, P., Vissers, G. J. M., Chintzoglou, G., D. Nóbrega-Siverio, V. H. Hansteen, Vissers, G., Schmit, D., Pereira, T. M. D., de la Cruz Rodríguez, Jaime,, M. Carlsson, V. M. J. Henriques, Rouppe van Der Voort, L., Scullion, E., T. Leifsen, Drews, A., D. R. Graham, Nóbrega-Siverio, D., A. Drews, P. Kohutova, A. Ortiz, Martínez-Sykora, J., E. Scullion, Quintero Noda, C., H. Skogsrud, J. Joshi, P. Zacharias, Leifsen, T., D. Schmit, Henriques, V. M. J., Froment, C., Bose, S., Joshi, J., Ortiz, A., Vissers, Gregal J. M.,, T. M. D. Pereira, Timmons, R., C. Froment, Popovas, A., Woods, M., Graham, D. R.   +80 more
core   +1 more source

The importance of horizontal Poynting flux in the solar photosphere [PDF]

, 2022
The electromagnetic energy flux in the lower atmosphere of the Sun is a key tool to describe the energy balance of the solar atmosphere. Current investigations on energy flux in the solar atmosphere focus primarily on the vertical electromagnetic flux ...
Stangalini, M., Silva, S., Jafarzadeh, S., Verth, G., Ballai, Istvan, Stangliani, M., Silva, Suzana S. A., Fedun, V., Stangliani, Marco, Murabito, M., Murabito, Mariarita, Jafarzadeh, Shahin, Verth, Gary, Silva, S.S.A., Ballai, I., Fedun, Viktor   +15 more
core   +1 more source

Post‐Processing Probabilistic Forecasts of the Solar Wind by Data Mining Similar Scenarios

Space Weather, Volume 24, Issue 4, April 2026.
Abstract The solar wind speed at Earth is one of the most important parameters regarding the effects of space weather on society. Thus far, most approaches for predicting the solar wind speed produce a single‐value time series without uncertainty, or utilize ensemble methods which require custom calibration development.
Daniel E. da Silva, Yash Parlikar, Shaela I. Jones, Charles N. Arge   +3 more
wiley   +1 more source

Derivation and Application of a Scaling between Hinode/SP and SDO/HMI Vector Magnetic Fields to Improve Magnetic Field Extrapolations

The Astrophysical Journal
Full-disk measurements of the solar magnetic field by the Helioseismic and Magnetic Imager (HMI) are often used for magnetic field extrapolations, but its limited spatial and spectral resolution can lead to significant errors.
C. Beck, A. Prasad, Q. Hu, M. S. Yalim, S. Gosain, D. Prasad Choudhary   +5 more
doaj   +1 more source

Small‐scale elemental abundance variations in Ryugu particles from touchdown 1

Meteoritics &Planetary Science, Volume 61, Issue 4, Page 580-599, April 2026.
Abstract Ryugu materials closely resemble CI chondrites' mineralogical, chemical, and isotopic compositions; yet minor but resolvable differences in certain elemental abundances are evident. In this study, the bulk chemical compositions of eight individual Ryugu particles (1.5–4.3 mg) from the first touchdown site (TD1) were determined using triple ...
Karina López García, Tetsuya Yokoyama, Ikshu Gautam, Makiko K. Haba, Tsuyoshi Iizuka, Nao Nakanishi, Ryota Fukai   +6 more
wiley   +1 more source

Limitations and Biases in the Retrieval of the Polar Magnetic Field. I. The Role of the Magnetic Filling Factor in Milne–Eddington Inversions of Simulated Hinode/SP Data

The Astrophysical Journal, 2023
We study the extent to which Milne–Eddington inversions are able to retrieve and characterize the magnetic landscape of the solar poles from observations by the spectropolarimeter on board Hinode.
Rebecca Centeno, Ivan Milić, Matthias Rempel, Nariaki V. Nitta, Xudong Sun   +4 more
doaj   +1 more source

Searching for Rotational X‐Ray Modulation on TIC 277539431

Astronomische Nachrichten, Volume 347, Issue 3, March 2026.
ABSTRACT TIC 277539431, a fast rotating M7 dwarf, was detected to host the highest latitude flare to date at 81°$$ {81}^{{}^{\circ}} $$. Magnetic activity like stellar flares occurring at high latitude indicate occurrence of coronal loops at these latitudes on fully‐convective M dwarfs. In contrast, sunspots usually occur below 30°$$ {30}^{{}^{\circ}} $
Desmond Dsouza, Katja Poppenhäger, Ekaterina Ilin   +2 more
wiley   +1 more source

Deconstructing Photospheric Spectral Lines in Solar and Stellar Flares

The Astrophysical Journal
During solar flares, spectral lines formed in the photosphere have been shown to exhibit changes to their profiles despite the challenges of energy transfer to these depths.
Aaron J. Monson, Mihalis Mathioudakis, Adam F. Kowalski   +2 more
doaj   +1 more source

Periodic Density Structures Observed in Ulysses Data: First Results

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Periodic density structures (PDSs) are advecting quasi‐periodic (periodicities between several minutes and several hours) density enhancements observed in the solar wind and corona. There is strong evidence that PDSs are formed at the Sun.
Brent M. Randol, Nicholeen Viall, Larry Kepko, Simone Di Matteo   +3 more
wiley   +1 more source

Observations of Locally Excited Waves in the Low Solar Atmosphere Using the Daniel K. Inouye Solar Telescope

The Astrophysical Journal Letters
We present an interpretation of the recent Daniel K. Inouye Solar Telescope (DKIST) observations of propagating wave fronts in the lower solar atmosphere.
Shah Mohammad Bahauddin, Catherine E. Fischer, Mark P. Rast, Ivan Milic, Friedrich Woeger, Matthias Rempel, Peter H. Keys, Thomas R. Rimmele   +7 more
doaj   +1 more source