Zobrazeno 1 - 9 of 9 pro vyhledávání: '"Bjorn R. Pettersen"'
2
Starspots: The zebra effect
Autor: George H. Fisher, Suzanne L. Hawley, Bjorn R. Pettersen
Publikováno v: Solar Physics. 142:197-204
Recent observations of brightness variations on the sun during the solar cycle have motivated us to re-examine the widely held view that cool, dark starspots, covering a significant fraction of the star, are the centers of magnetic activity on BY Dra
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::393084f00cb282ed36174b6971d71082
https://doi.org/10.1007/bf00156642
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4
Simultaneous Extreme-Ultraviolet Explorer and Optical Observations of AD Leonis: Evidence for Large Coronal Loops and the Neupert Effect in Stellar Flares
Autor: Suzanne L. Hawley, Susana E. Deustua, Theodore Simon, Scott L. Cully, Bjorn R. Pettersen, Christopher M. Johns-Krull, J. A. Valenti, William Spiesman, Marek Jablonski, Verne V. Smith, George H. Fisher
Publikováno v: The Astrophysical Journal. 453:464
We report on the first simultaneous Extreme-Ultraviolet Explorer (EUVE) and optical observations of flares on the dMe flare star AD Leonis. The data show the following features: (1) Two flares (one large and one of moderate size) of several hours dur
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::85b5f8ffb0f4cbad973fc226c18cdaef
https://doi.org/10.1086/176408
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5
The great flare of 1985 April 12 on AD Leonis
Autor: Suzanne L. Hawley, Bjorn R. Pettersen
Publikováno v: The Astrophysical Journal. 378:725
Photometric and spectroscopic observations covering the wavelength range 1200-8000 A are presented for a giant flare on the M dwarf star AD Leo. The flare radiated more than 10 34 ergs in this wavelength region and lasted for more than 4 hr. The magn
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b589a83dbffe600978e6568e00bd49b8
https://doi.org/10.1086/170474
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6
Atmospheric activity in red dwarf stars
Autor: Bjorn R. Pettersen
Publikováno v: Vistas in Astronomy. 30:41-51
Radiation losses from quiescent and flaring regions of red dwarf atmospheres are compared and found to be equally important. The flare emission on all wavelengths approaches 1% of the stellar bolometric luminosity for active dMe stars, but is 100 tim
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0b5b7bd571a87def4294db4c7d441c93
https://doi.org/10.1016/0083-6656(87)90019-5
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7
A review of stellar flares and their characteristics
Autor: Bjorn R. Pettersen
Publikováno v: Solar Physics. 121
We review the flaring activity of stars across the HR-diagram. Brightenings have been reported along the entire Main Sequence and in many stars off the Main Sequence. Some stars are decidedly young, others are in advanced stages of stellar evolution.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::72b2f3a47d5145d1da758ace8f11266b
https://doi.org/10.1007/bf00161702
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8
Atmospheric Activity in the Outer Envelopes of Cool Dwarf Stars
Autor: Bjorn R. Pettersen
Publikováno v: Activity in Cool Star Envelopes ISBN: 9789401078276
We review the observed properties of the radiation from flare star atmospheres and stellar flare regions. Data from satellite and ground-based instruments are used to investigate interrelations between the photospheres, chromospheres, transition regi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::643f935605e3d889c77691e653c041e5
https://doi.org/10.1007/978-94-009-2951-7_7
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