Results 41 to 50 of about 440 (199)

FAST Detection of OH Emission in the Carbon-rich Planetary Nebula NGC 7027

The Astrophysical Journal
We present the first detection of the ground-state OH emission line at 1612 MHz toward the prototypical carbon-rich planetary nebula (PN) NGC 7027, utilizing the newly installed ultrawideband (UWB) receiver of the Five-hundred-meter Aperture Spherical ...
Xu-Jia Ouyang, Yong Zhang, Chuan-Peng Zhang, Peng Jiang, Jun-ichi Nakashima, Xi Chen, Hai-Hua Qiao, Xu-Ying Zhang, Hao-Min Sun, Xiao-Hu Li, Albert Zijlstra   +10 more
doaj   +1 more source

The Discovery of the Zeeman Effect in 38 GHz Class II Methanol Masers

The Astrophysical Journal, 2023
Magnetic fields likely play an important role in star formation, but the number of directly measured magnetic field strengths remains scarce. We observed the 38.3 and 38.5 GHz Class II methanol (CH _3 OH) maser lines toward the high-mass star-forming ...
E. Momjian, A. P. Sarma
doaj   +1 more source

New Constraints on the Jovian Narrowband Radio Components From Juno/Waves Observations and 3D Geometrical Simulations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract Measurements of Waves instrument onboard the Juno spacecraft suggest that narrowband kilometric radiation (nKOM; 20–141 kHz) and narrowband low‐frequency radiation (nLF; 5–70 kHz) are generated within the plasma near the Io plasma torus (IPT) in low‐latitude regions.
A. Boudouma, P. Zarka, C. K. Louis, M. Imai, C. Briand   +4 more
wiley   +1 more source

Frequency Extensions of Auroral Kilometric Radiation: The Key to Unlocking Earth's Radio Response to Substorms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Auroral kilometric radiation (AKR) provides a sensitive probe of magnetospheric dynamics during substorms. We analyze an extended data set of AKR bursts observed by the WIND spacecraft to investigate how the frequency structure of AKR responds to substorm onset and evolution.
Simon James Walker, Caitríona M. Jackman, Alexandra R. Fogg, Siyuan Wu, James E. Waters   +4 more
wiley   +1 more source

13CH3OH Masers Associated With a Transient Phenomenon in a High-mass Young Stellar Object [PDF]

, 2020
We report the first detection of isotopic methanol (13CH3OH) maser emission in interstellar space. The emission was detected toward the high-mass young stellar object G358.93-0.03 during monitoring of a flare in the 6.7 GHz methanol (CH3OH) maser ...
Chen, Xi, Ellingsen, Simon P., Kaczmarek, Jane F., Wang, J., Ellingsen, S. P., Ren, Z. -Y., Sobolev, Andrej M., Stecklum, B., Kaczmarek, J. F., Voronkov, M., Breen, Shari L., Zhang, Jiangshui, SANNA, ALBERTO, Brogan, Crystal, Hunter, T. R., Breen, S., Li, B., Burns, Ross A., Sobolev, A. M., Voronkov, M. A., Heever, SP van den, Shen, Zhi-Qiang, Hunter, Todd R., Ren, Z., Heever, S., Shen, Z. -Q., Sugiyama, Koichiro, Kaczmarek, J., Burns, R., Ren, Zhi-Yuan, Chen, X., Linz, H., Chibueze, James, Kim, K., MacLeod, Gordon C., Sobolev, A., Voronkov, Maxim A., Stecklum, Bringfried, Hunter, T., MacLeod, G., Kim, K. -T., Zhang, J., Brogan, C., Burns, R. A., Shen, Z., Linz, Hendrik, Sugiyama, K., Breen, S. L., Ellingsen, S., Hirota, T., MacLeod, G. C., Kim, Kee-Tae, Menten, Karl, Li, Bin, Wang, Jin, Menten, K., Sanna, A., Chibueze, J., Heever, S. P. V. D., Hirota, Tomoya   +59 more
core   +1 more source

A Search for Asymmetric Kinematic Components in Circumstellar Envelopes Using OH Main Line Masers

The Astrophysical Journal
Circumstellar OH maser lines are useful for studying the dynamics of the circumstellar envelope (CSE) around evolved stars. This study aims to identify CSEs around cold stars, which exhibit deviations from the spherical expansion, by comparing the ...
Jia-Yong Xie, Jun-ichi Nakashima, Yong Zhang   +2 more
doaj   +1 more source

Evidence of an Extended Alfvén Wing System at Enceladus: Cassini's Multi‐Instrument Observations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract We report in situ evidence for Enceladus' Alfvén wing system and its coupling with Saturn's ionosphere, based on multi‐instrument observations from the Cassini spacecraft. Analysis of 36 events, including 13 from non‐flyby paths, confirms the existence of a Main Alfvén Wing (MAW) current system generated at Enceladus, and associated Reflected ...
L. Z. Hadid, T. Chust, J.‐E. Wahlund, M. W. Morooka, E. Roussos, O. Witasse, J. Rabia, D. Pisa, K. Kim, N. J. T. Edberg, A. M. Rymer, L. Lamy, S. Kotsiaros, S. Aizawa, A. Jeandet, R. Modolo, N. André, P. Canu, C. F. Bowers, X. Jia, A. J. Coates, G. H. Jones, A. Parsec‐Wallis, O. Agiwal, M. K. G. Holmberg, Q. Nénon, H. Cao, W. S. Kurth, M. K. Dougherty   +28 more
wiley   +1 more source

Peculiar Spectral Property of Coherent Radio Emission from a Hot Magnetic Star: The Case of an Extreme Oblique Rotator

The Astrophysical Journal, 2023
We report ultra-wideband (0.4–4.0 GHz) observation of coherent radio emission via electron cyclotron maser emission (ECME) produced by the hot magnetic star HD 142990.
Barnali Das, Poonam Chandra
doaj   +1 more source

The electron–cyclotron maser for astrophysical application [PDF]

The Astronomy and Astrophysics Review, 2006
The electron–cyclotron maser is a process that generates coherent radiation from plasma. In the last two decades, it has gained increasing attention as a dominant mechanism of producing high-power radiation in natural high-temperature magnetized plasmas.
openaire   +2 more sources

A Personal Voyage Among Earth and Space Physics Disciplines

Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.
Abstract I have organized my thoughts in an autobiographical way in relation to the several distinct phases of my career encompassing Earth and space physics. I discuss atmospheric and space physics topics of interest to me in an international context, and I emphasize the value of community activities and international conferences for the interchange ...
Michael J. Rycroft
wiley   +1 more source