Solar and stellar activity from the photosphere to the corona  Page description

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Details of project

  
Identifier
38013
Type K
Principal investigator Van Driel Gesztelyi, Lídia
Title in Hungarian A Nap- és csillagaktivitás a fotoszférától a koronáig
Title in English Solar and stellar activity from the photosphere to the corona
Panel Physics
Department or equivalent Konkoly Thege Miklós Astronomical Institute (Research Centre for Astronomy and Earth Sciences)
Participants Kővári, Zsolt
Oláh, Katalin Ilona
Starting date 2002-01-01
Closing date 2005-12-31
Funding (in million HUF) 5.640
FTE (full time equivalent) 0.00
state closed project





 

Final report

  
Results in Hungarian
A Nap aktivitási jelenségek 3-dimenziós rekonstrukcióját végeztük el, űreszközök észleléseit modellezéssel kombinálva. Kimutattuk, hogy (1) a konvektív zónában levő örvények a felszálló mágneses fluxuscsövek deformációjának legfőbb okozói; (2) a nyírott mágneses terek disszipációján alapuló korona fűtési modellek jobb egyezést mutatnak az észlelésekből levont skálázási szabályokkal, mint az elektromágneses hullámok disszipációján alapuló modellek; 3) a fehér flerek esetében a koronában jelentősen magasabb a gáznyomás, mint az azonos energiát felszabadító, de fehér fényű emissziót nem produkáló flerekben; (4) az első észlelési bizonyítékot szolgáltattuk a koronalyukak határa mentén folytonos mágneses átkötődésre; (5) korona kitörésekben különböző modellek kombinált, egymást segítő működése vezet aktivitáshoz. Továbbá, úttörő munkát végeztünk a mágneses helicitás észlelésekből való meghatározására a koronában és korona kitörések során kidobott interplanetáris mágneses felhőkben, az első kvantitatív bizonyítékot szolgáltatván fizikai kapcsolatukra. A csillagaktivitás terén sikerült megvalósítani a legtöbb célkitűzésünket. Több vizsgálatot végeztünk a csillagok aktivitására vonatkozóan hosszú időskálájú fotometriai és spektroszkópiai méréseket felhasználva. Megerősítettük a csillagokra kapott legrövidebb ciklushosszakat és összefüggésüket a rotációs periódussal. Több aktív csillagon mutattunk ki differenciális rotációt Doppler leképezés és fotometriai adatok felhasználásával (UZ Lib, zeta And, LQ Hya, IL Hya). Részletesen vizsgáltuk több csillagon az aktív hosszúságok helyzetét (IM Peg, UZ Lib, FK Com).
Results in English
In solar studies we carried out 3-D reconstruction of solar events based on multi-wavelength space-born data combined with modelling. We have shown, that (1) in the convective zone emerging flux tubes are deformed mainly by huge vortices; (2) coronal heating models based on dissipation of stressed magnetic fields were in better agreement with the scaling laws deduced from observations than the models based on MHD wave dissipation; (3) white-light flares have higher coronal pressure than flares of the same energy, but having no white-light emission; (4) the first observational evidence for continuous magnetic reconnection along coronal hole boundaries; (5) in coronal mass ejections (CMEs) a combination of different models lead to eruption. Furthermore, we have done pioneering work on deducing magnetic helicity from observations both in the solar corona and in interplanetary magnetic clouds (MCs), which are ejected in CMEs, providing the first quantitative evidence for the direct corrrespondence between CMEs and MCs. In active star studies, we succesfully realised most of our goals. We carried our several studies on stellar activity using long-term spectroscopic and photometric observational data. We confirmed the shortest cycle lengths of stars and their correlation with the stars' rotational periods. Differential rotation was revelaed on several stars from Doppler maps and photometric data (UZ Lib, zeta And, LQ Hya, IL Hya). We studied the location of the active longitudes on IM Peg, UZ Lib and FK Com in details.
Full text http://real.mtak.hu/436/
Decision
Yes





 

List of publications

  
De Groof A; Berghmans D; van Driel-Gesztelyi L; Poedts, S: Intensity variations in EIT shutterless mode: waves or flows?, Astron Astrophys 2004 415: 1141-1151, 2004
Mandrini CH; Démoulin P; van Driel-Gesztelyi; Green LM; Lopez-Fuentes MC: The magnetic helicity budget of solar active regions from the photosphere to magnetic clouds, Astrophys Space Sci 290 No. 3-4: 319-344, 2004
Green LM; Lopez-Fuentes MC; Mandrini CH: Démoulin P; van Driel-Gesztelyi L; Culhane JL: The magnetic helicity budget of a CME-prolific active region, Solar Phys 208: 43-68, 2002
Oláh K; Strassmeier K; Weber M: Doppler imaging of stellar surface structure XVIII, The very active RS CVn binary UZ Librae revisited, Astron. Astrophys 389: 202-212, 2002
Bleybel A; Amari T; van Driel-Gesztelyi L; Leka KD: Global budget for an eruptive active region, I. Equilibrium reconstruction approach, Astron Astrophys 395: 685-695, 2002
Oláh K; Strassmeier K; Ganzer Th: Time series photometric spot modelling V. Phase coherence of spots on UZ Librae, Astron Nachr 323, 5: 453-461, 2002
Ribárik G; Oláh K; Strassmeier K: New computer code for time-series photometric spot modelling, Astron Nachr, Proc. 1st Thinkshop: 323, 3-4: 7-10., 2002
Oláh K; Strassmeier K: Starspot cycles from long-term photometry, Astron Nachr, Proc. 1st Thinkshop: 323, 3-4: 361-366, 2002
van Driel-Gesztelyi L; Démoulin P; Mandrini CH; Thompson B; Plunkett S; Kővári Zs; Aulanier G; Young A; Lopez-Fuentes, M; Poedts, S: Helicity loading and dissipation: the helicity budget of AR 7978 from the cradle to the grave, Multi-Wavelength Observations of Coronal Structure and Dynamics -- Proc. of Yohkoh 10th Anniversary Meeting. P.C.H. Martens and D. Kauffman (eds.) COSPAR Colloquia Series, 2002
Matthews SA; van Driel-Gesztelyi, L; Nitta N; Hudson HS: Multi-wavelength observations of Yohkoh white-light flares, Multi-Wavelength Observations of Coronal Structure and Dynamics -- Proc. of Yohkoh 10th Anniversary Meeting. P.C.H. Martens and D. Kauffman (eds.). COSPAR Colloquia Serie, 2002
van Driel-Gesztelyi L; Démoulin P; Mandrini CH: Observations of helicity (meghivott attekinto cikk), in J. Buchner and A.A. Pevtsov (eds.): Magnetic Helicity at Sun, in the Solar Wind and Magnetospheres, Adv Space Res 32/10: 1855-1866, 2003
van der Holst B; van Driel-Gesztelyi L; Poedts S: CME shock warps coronal streamer - observation and MHD simulation, 10th European Solar Physics Meeting. Solar Variability: From Core to Outer Frontiers, in Prague, Czech Republic, ISBN 92-9092-816-6, ESA SP-506, 71-74, 2002
van Driel-Gesztelyi L; Démoulin, P; Mandrini CH; Harra KL; Klimchuk J: The long-term evolution of AR 7978: Scalings of coronal plasma parameters with the mean photospheric magnetic field, Astrophys J 586: 579-591, 2003
Démoulin P; van Driel-Gesztelyi L; Mandrini CH; Klimchuk J; Harra K: The long-term evolution of AR 7978: Testing coronal heating models, Astrophys J 586: 592-605, 2003
van Driel-Gesztelyi L; Démoulin P; Mandrini CH; Harra LK; Klimchuk J: An observational test for coronal heating models, Stars as Suns: Activity, Evolution and Planets, Proc. IAU Symp. 219, ed.: A. Benz and A. Dupree, 2004, pp. 473-477, 2004
Lopez Fuentes MC; Démoulin P; Mandrini CH; Pevtsov AA; van Driel-Gesztelyi L: Magnetic twist and writhe of active regions, On the origin of deformed flux tubes, Astron Astrophys 397: 305-318, 2003
Green LM; Démoulin P; Mandrini CH; van Driel-Gesztelyi, L: How are emerging flux, flares and CMEs related to magnetic polarity imbalance in MDI data?, Solar Phys 215: 307-325, 2003
Matthews SA; van Driel-Gesztelyi L; Hudson HS; Nitta NV: A catalogue of white-light flares observed by Yohkoh, Astron Astrophys 409: 1107-1125, 2003
Harra LK; Matthews SA; van Driel-Gesztelyi, L: Evidence of Flaring in a Transequatorial Loop on the Sun, Astrophys J 598: L59-L62, 2003
Green LM; Lopez-Fuentes MC; Mandrini CH; van Driel-Gesztelyi L; Démoulin P: Active region helicity evolution and related coronal mass ejection activity, in J. Buchner and A.A. Pevtsov (eds.): Magnetic Helicity at Sun, in the Solar Wind and Magnetospheres, Adv Space Res 32/10: 1959-1964, 2003
Oláh K; Jurcsik H; Strassmeier KG: Differential rotation on UZ Librae, Astron Astrophys 410: 685-689, 2003
Madjarska MS; Doyle JG; van Driel-Gesztelyi L: First evidence for magnetic reconnection along coronal hole boundaries, Astrophys J 2004, 603: L57-L59, 2004
Goff CP; Matthew SA; van Driel-Gesztelyi L; Harra, LK: Relating magnetic field strength to hard X-ray emission in solar flares, Asron Astrophys 423: 363-372, 2004
Kővári Zs; Strassmeier KG; Granzer T; Weber M; Oláh K; Rice JB: Doppler imaging of stellar surface structure - XXII. Time-series mapping of the young rapid rotator LQ Hydrae, Astron Astrophys 417: 1047-1054, 2004
Mitra-Kraev U; Harra LK; Gudel M; Audard M; Branduardi-Raymont G; Kay HRM; Mewe R; Raassen AJJ; van Driel-Gesztelyi L: Relationship between X-ray and ultraviolet emission of flares from DMe stars observed by XMM-Newton, Astron Astrophys 431: 679-686, 2005
van Driel-Gesztelyi L: Coronal mass ejections and magnetic helicity ( meghivott osszefoglaló cikk), Solar Magnetic Phenomena, eds.: A. Hanslmeier, A. Veronig and M. Messerotti; Kluwer Academic Publishers, 57-86, 2004
Weber, K.G. Strassmeier, J. Bartus, H. Korhonen, Zs. Kővári, K. Oláh, A. Schwope, A. Staude, M. Steffen: Science with the STELLA robotic observatory, Proc. Cool Stars, Stellar Systems and the Sun 13, July 5-9, 2004 Hamburg, Germany, ESA-SP 560, p. 1025, 2005
Zs. Kővári, J. Bartus, K.G. Strassmeier, K. Oláh, J. Rice, Sz. Csizmadia: First Doppler Images of zeta Andromedae, Proc. Cool Stars, Stellar Systems and the Sun 13, July 5-9, 2004 Hamburg, Germany, ESA-SP, 560, p. 727 Hamburg, Germany, ESA-SP, 560, p. 727, 2005
Kővári, Zs., Oláh, K., Bartus, J. , Strassmeier, K.G., Granzer, T.: Spot Modelling of zeta Andromedae, AP&SS, elfogadva, megj. alatt, 2006
Kővári, Zs., Oláh, K., Bartus, J. , Strassmeier, K.G., Weber, M.,Washuettl, A., Rice, J.B., Csizmadia, Sz.: Doppler Images of zeta Andromedae, AP&SS, elfogadva, megj. alatt, 2006
Oláh, K.: Active Longitudes in Close Binaries, AP&SS, elfogadva, megj. alatt, 2006
Oláh, K., Korhonen, H., Kővári, Zs., Forgács-Dajka, E., Strassmeier, K.G.: Study of FK Comae Berenices - VI. Spot motions, phase jumps and a flip-flop from time-series modelling, Astronomy and Astrophysics, elfogadva, megjelenés alatt, 2006
Fazakerley, A.N.; Harra, L.K.; Culhane, J.L.; van Driel-Gesztelyi, L.; Lucek, E.; Matthews, S.A.; Owen, C.J.; Mazelle, C.; Balogh, A.; Réme, H.: Relating in-situ Observations of an Interplanetary Coronal Mass Ejection to the Conditions at its Site of Origin in the Solar Corona, Geophys. Res. Let. 32, 13, L13105-13108., 2005
Goff, C.P.; van Driel-Gesztelyi, L.; Harra, L.K.; Matthews, S.A.; Mandrini, C.H.: A slow Coronal Mass Ejection with Rising X-ray Source, Astron. Astrophys. 434. 761-771., 2005
Mandrini, C.H.; Pohjolainen, S.; Dasso, S.; Green, L.M.; Démoulin, P.; van Driel-Gesztelyi, L.; Foley, C.; Copperwheat, C.: The Smallest Source Region of an Interplanetary Magnetic Cloud: a Mini-Sigmoid, Adv. Space Res., 36(8),1579-1586, 2005
Luoni, M.L.; Mandrini, C.H.; Dasso, S.; van Driel-Gesztelyi, L.; Démoulin, P.: Tracing Magnetic Helicity from the Solar Corona to the Interplanetary Space, J. Atm. Solar-Terr. Phys. 67, 1734-1743., 2005
Dasso, S.; Mandrini, C.H.; Luoni, M.L.; Gulisano, A.M.; Nawacki, M.S.; Pohjolainen, S.; van Driel-Gesztelyi, L.; Démoulin, P.: Linking coronal to heliospheric magnetic helicity: a new model-independent technique to compute helicity in magnetic clouds, Proc. Solar Wind-11 - SOHO 16 "Connecting Sun to Heliosphere", ed.: H. Lacoste, ESA SP-592, 605-608., 2005
Mandrini, C.H.; Dasso, S.; Luoni, M.L.; Pohjolainen, S.; Démoulin, P.; van Driel-Gesztelyi, L.: Quantitative Link between Solar Ejecta and Interplanetary Magnetic Clouds: Magnetic Helicity, Proc. of ?Chromospheric and Coronal Magnetic Fileds?, Katlenburg-Lindau, Germany, 30 August-2 September 2005, November 2005. (ESA SP-596 CD, November 2005)., 2005
Williams, D.R.; Török, T.; Démoulin, P.; van Driel-Gesztelyi, L.; Kliem, B.: Eruption of a Kink-Unstable Filament in Active Region NOAA 10696, Proc. of Chromospheric and Coronal Magnetic Fields, Katlenburg-Lindau, Germany, 30 August-2 September 2005 (ESA SP-596, CD, November 2005)., 2005
Harra, L.K.; Démoulin, P.; Matthews, S.A.; Mandrini, C.; van Driel-Gesztelyi, L.; Culhane; J.L.; Fletcher, L.: Flows in the Solar Atmosphere due to the Eruptions on the 15th July, 2002, Astron. Astrophys. 438, 1099-1106., 2005
Schmieder, B; van Driel-Gesztelyi, L.: Source Regions of Coronal Mass Ejections, K. Dere, J. Wang, and Y. Yan. (eds): Coronal and Stellar Mass Ejections, Proc. IAU Symp. 226, Cambridge: Cambridge University Press, pp. 149-160., 2005
Mandrini, C.H.; Pohjolainen, S.; Dasso, S.; Green, L.M.; Démoulin, P.; van Driel-Gesztelyi, L.; Copperwheat, C.; Foley, C.: Interplanetary Flux Rope Ejected from an X-ray Bright Point. The Smallest Magnetic Cloud Source Region ever Observed, Astron. Astrophys. 434, 725-740., 2005
Williams, D.R.; Török, T.; Démoulin, P.; van Driel-Gesztelyi, L.; Kliem, B.: Eruption of a Kink-Unstable Filament in Active Region NOAA 10696, Astrophys. J. 628, L163-166., 2005
Goff, C.P.; van Driel-Gesztelyi, L.; Harra, L.K.; Matthews, S.A.; Mandrini, C.H.: Erupting flux rope, rising X-ray source and slow CME on 12 April 2002, Proc. of the 11th European Solar Physics Meeting (SPM-11) The Dynamic Sun: Challenges for Theory and Observations; (ESA SP-600, CD, December 2005) 6.2., 2005
Goff, C.P.; van Driel-Gesztelyi, L.; Culhane, J.L.; Matthews, S.A.; Harra, L.K.; Démoulin, P.; Mandrini, C.H.; Kurokawa, H.: A Series of Compact Flares with an Associated CME, Proc. of the 11th European Solar Physics Meeting (SPM-11) The Dynamic Sun: Challenges for Theory and Observations; (ESA SP-600, CD, December 2005) P.6., 2005
Fazakerley, A.N.; Harra, L.K.; Culhane, J.L.; van Driel-Gesztelyi, L.; Lucek, E.; Matthews, S.A.; Owen, C.J.; Mazelle, C.; Balogh, A.; Réme, H.: Relating near-Earth Observations of an Interplanetary Coronal Mass Ejection to the Conditions at its Site of Origin in the Solar Corona, Proc. of the 11th European Solar Physics Meeting (SPM-11) The Dynamic Sun: Challenges for Theory and Observations; (ESA SP-600, CD, December 2005) 6.3., 2005




 

Events of the project

  
2012-01-04 06:48:32
Kutatóhely váltás
A kutatás helye megváltozott. Korábbi kutatóhely: (MTA Csillagászati és Földtudományi Kutatóközpont), Új kutatóhely: Konkoly Thege Miklós Csillagászati Intézet (MTA Csillagászati és Földtudományi Kutatóközpont).



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