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Solar flares at submillimeter wavelengths

Abstract

We discuss the implications of the first systematic observations of solar flares at submillimeter wavelengths, defined here as observing wavelengths shorter than 3 mm (frequencies higher than 0.1 THz). The events observed thus far show that this wave band requires a new understanding of high-energy processes in solar flares. Several events, including observations from two different observatories, show during the impulsive phase of the flare a spectral component with a positive (increasing) slope at the highest observable frequencies (up to 405 GHz). To emphasize the increasing spectra and the possibility that these events could be even more prominent in the THz range, we term this spectral feature a “THz component”. Here we review the data and methods, and critically assess the observational evidence for such distinct component(s). This evidence is convincing. We also review the several proposed explanations for these feature(s), which have been reported in three distinct flare phases. These data contain important clues to flare development and particle acceleration as a whole, but many of the theoretical issues remain open. We generally have lacked systematic observations in the millimeter-wave to far-infrared range that are needed to complete our picture of these events, and encourage observations with new facilities.

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Notes

  1. One solar flux unit (SFU)=10−19 ergs cm−2 s−1 Hz−1=10−22 W m−2 Hz−1.

  2. We adopt the IAU target identification scheme here: any solar event can be specified as SOLyyyy-mm-dd:Thh:mm:ss in time, and position coordinates can also be added for disambiguation if needed (Leibacher et al. 2010).

References

  • Akabane K, Nakajima H, Ohki K, Moriyama F, Miyaji T (1973) Sol Phys 33:431

    ADS  Google Scholar 

  • Arnal EM, Morras R, Dubner GM, et al. (2011) Bol Asoc Argentina Astron Plata Argentina 54:435

    ADS  Google Scholar 

  • Bastian TS, Benz AO, Gary DE (1998) Annu Rev Astron Astrophys 36:131

    ADS  Google Scholar 

  • Bean BR, Dutton EJ (1961) J Geophys Res 66:3717

    ADS  Google Scholar 

  • Benz AO (1993) Plasma astrophysics: kinetic processes in solar and stellar coronae. Astrophysics and space science library, Vol. 184, Kluwer Academic, Dordrecht

    Google Scholar 

  • Benz AO, Su H, Magun A, Stehling W (1992) Astron Astrophys Suppl Ser 93:539

    ADS  Google Scholar 

  • Benz AO, Krucker S, Hurford GJ, et al (2012) Proc SPIE, 8443

  • Cawthorne TV (1985) Mon Not R Astron Soc 216:795

    ADS  Google Scholar 

  • Cogdell JR (1972) Sol Phys 22:147

    ADS  Google Scholar 

  • Correia E, Kaufmann P, Magun A (1994). In: IAU symp. Infrared solar physics, vol. 154, pp 125–129

    Google Scholar 

  • Costa JER, Correia E, Kaufmann P, Magun A, Herrmann R (1995) Sol Phys 159:157

    ADS  Google Scholar 

  • Costa JER, Simões PJA, Giménez de Castro CG (2013), in preparation

  • Covington AE (1973) Sol Phys 33:439

    ADS  Google Scholar 

  • Cox DP, Tucker WH (1969) Astrophys J 157:1157

    ADS  Google Scholar 

  • Cristiani G, Giménez de Castro CG, Luoni ML, Mandrini CH, Rovira MG, Kaufmann P, Machado M (2007a) Adv Space Res 39:1445

    ADS  Google Scholar 

  • Cristiani G, Giménez de Castro CG, Mandrini CH, Machado ME, Silva IDBE, Kaufmann P, Rovira MG (2008) Astron Astrophys 492:215

    ADS  Google Scholar 

  • Cristiani G, Giménez de Castro CG, Mandrini CH, Machado ME, Rovira MG (2009) Adv Space Res 44:1314

    ADS  Google Scholar 

  • Cristiani GD, Giménez de Castro CG, Simões PJA, Mandrini CH, Kaufmann P (2013)

  • Cristiani G, Martínez G, Mandrini C, Giménez de Castro C, Rovira M, Kaufmann P, Levato H (2005) J Atmos Sol-Terr Phys 67:1744

    ADS  Google Scholar 

  • Cristiani G, Martinez G, Mandrini CH, Giménez de Castro CG, da Silva CW, Rovira MG, Kaufmann P (2007b) Solar Phys 240:271

    ADS  Google Scholar 

  • Croom DL (1970) Sol Phys 15:414

    ADS  Google Scholar 

  • Crusius-Waetzel AR (1991) Astrophys J 368:390

    ADS  Google Scholar 

  • De Jager C, Kuijpers J, Correia E, Kaufmann P (1987) Sol Phys 110:317

    ADS  Google Scholar 

  • Doschek GA, Feldman U, Rosenberg FD (1977) Astrophys J 215:329

    ADS  Google Scholar 

  • Doschek GA, Mariska JT, Sakao T (1996) Astrophys J 459:823

    ADS  Google Scholar 

  • Dulk GA (1985) Annu Rev Astron Astrophys 23:169

    ADS  Google Scholar 

  • Emslie AG, Smith DF (1984) Astrophys J 279:882

    ADS  Google Scholar 

  • Fleishman GD, Kontar EP (2010) Astrophys J Lett 709:L127

    ADS  Google Scholar 

  • Fleishman GD, Toptygin IN (2007a) Mon Not R Astron Soc 381:1473

    ADS  Google Scholar 

  • Fleishman GD, Toptygin IN (2007b) Phys Rev E 76:017401

    ADS  Google Scholar 

  • Fletcher L, Hannah IG, Hudson HS, Metcalf TR (2007) Astrophys J 656:1187

    ADS  Google Scholar 

  • Fontenla JM, Balasubramaniam KS, Harder J, (2007) Astrophys J 667:1243

    ADS  Google Scholar 

  • Fürst E (1971) Sol Phys 18:84

    ADS  Google Scholar 

  • Gaizauskas V, Tapping KF (1980) Astrophys J 241:804

    ADS  Google Scholar 

  • Garcia HA (1994) Sol Phys 154:275

    ADS  Google Scholar 

  • Giampapa MS, Africano JL, Klimke A, Parks J, Quigley RJ, Robinson RD, Worden SP (1982) Astrophys J Lett 252:L39

    ADS  Google Scholar 

  • Giménez de Castro CG, Raulin J-P, Makhmutov VS, Kaufmann P, Costa JER (1999) Astron Astrophys 140:373

    ADS  Google Scholar 

  • Giménez de Castro CG, Trottet G, Silva-Valio A, Krucker S, Costa JER, Kaufmann P, Correia E, Levato H (2009) Astron Astrophys 507:433

    ADS  Google Scholar 

  • Guidice DA, Castelli JP (1975) Sol Phys 44:155

    ADS  Google Scholar 

  • Heinzel P, Avrett EH (2011) Solar Phys 277:31

    ADS  Google Scholar 

  • Heitler W (1954) Quantum theory of radiation. Clarendon, Oxford

    MATH  Google Scholar 

  • Herrmann R, Magun A, Costa JER, Correia E, Kaufmann P (1992) Sol Phys 142:157

    ADS  Google Scholar 

  • Hudson HS (1975) Sol Phys 45:69

    ADS  Google Scholar 

  • Hudson HS, Ohki K, (1972) Solar Phys 23:155

    ADS  Google Scholar 

  • Hurford GJ, Krucker S, Lin RP, Schwartz RA, Share GH, Smith DM (2006) Astrophys J Lett 644:L93

    ADS  Google Scholar 

  • Jackson JD (1962) Classical electrodynamics

    Google Scholar 

  • Jelley JV (1955) Br J Appl Phys 6:227

    ADS  Google Scholar 

  • Kaufmann P, Correia E, Costa JER, Vaz AMZ, Dennis BR (1985) Nature 313:380

    ADS  Google Scholar 

  • Kaufmann P, Giménez de Castro CG, Makhmutov VS, Raulin J, Schwenn R, Levato H, Rovira M (2003) J Geophys Res 108:1280

    Google Scholar 

  • Kaufmann P, Holman GD, Su Y, Gimenez de Castro CG, Correia E, Fernandes LOT, de Souza RV, Marun A, Pereyra P (2012) Sol Phys 279:465

    ADS  Google Scholar 

  • Kaufmann P, Raulin J-P, Correia E, Costa JER, de Castro CGG, Silva AVR, Levato H, Rovira M, Mandrini C, Fernández-Borda R, Bauer OH (2001) Astrophys J 548:L95

    ADS  Google Scholar 

  • Kaufmann P, Raulin J, Melo AM, Correia E, Costa JER, de Castro CGG, Silva AVR, Yoshimori M, Hudson HS, Gan WQ, Gary DE, Gallagher PT, Levato H, Marun A, Rovira M (2002) Astrophys J 574:1059

    ADS  Google Scholar 

  • Kaufmann P, Raulin J de Castro CGG, Levato H, Gary DE, Costa JER, Marun A, Pereyra P, Silva AVR, Correia E (2004) Astrophys J Lett 603:L121

    ADS  Google Scholar 

  • Kaufmann P, Raulin J-P (2006) Phys Plasmas 13:701

    Google Scholar 

  • Kaufmann P, Strauss FM, Laporte C, Opher R (1980) Astron Astrophys 87:58

    ADS  Google Scholar 

  • Kaufmann P, Trottet G, Giménez de Castro CG, Raulin J, Krucker S, Shih AY, Levato H (2009) Sol Phys 255:131

    ADS  Google Scholar 

  • Kašparová J, Varady M, Heinzel P, Karlický M, Moravec Z (2009) Astron Astrophys 499:923

    ADS  Google Scholar 

  • Kiener J, Gros M, Tatischeff V, Weidenspointner G (2006) Astron Astrophys 445:725

    ADS  Google Scholar 

  • Klein K-L (1987) Astron Astrophys 183:341

    ADS  Google Scholar 

  • Klopf M, Kaufmann P, Raulin J (2010). In: American astronomical society meeting abstracts, vol. 216, 404.31

    Google Scholar 

  • Kosugi T, Dennis BR, Kai K (1988) Astrophys J 324:1118

    ADS  Google Scholar 

  • Kundu MR (1965) Solar radio astronomy. Interscience Publication, New York

    Google Scholar 

  • Kuznetsov SN, Kurt VG, Myagkova IN, Yushkov BY, Kudela K (2006) Sol Syst Res 40:104

    ADS  Google Scholar 

  • Leibacher JW, Sakurai T, Schrijver K, van Driel-Gesztely L (2010) Sol Phys 263:1. doi:10.1007/s11207-010-9553-0

    ADS  Google Scholar 

  • Lindsey CA, Yee S, Roellig TL, Hills R, Brock D, Duncan W, Watt G, Webster A, Jefferies JT (1990) Astrophys J Lett 353:L53

    ADS  Google Scholar 

  • Lingenfelter RE, Ramaty R (1967) Planet Space Sci 15:1303

    ADS  Google Scholar 

  • Louarn P, Le Queau D, Roux A (1987) Sol Phys 111:201

    ADS  Google Scholar 

  • Loukitcheva MA, Solanki SK, White S (2008) Astrophys Space Sci 313:197

    ADS  Google Scholar 

  • Lüthi T, Lüdi A, Magun A (2004a) Astron Astrophys 420:361

    ADS  Google Scholar 

  • Lüthi T, Magun A, Miller M (2004b) Astron Astrophys 415:1123

    ADS  Google Scholar 

  • Makhmutov VS, Raulin J, Giménez de Castro CG, Kaufmann P, Correia E (2003) Sol Phys 218:211

    ADS  Google Scholar 

  • McClements KG, Brown JC (1986) Astron Astrophys 165:235

    ADS  Google Scholar 

  • McCray R (1966) Science 154:1320

    ADS  Google Scholar 

  • Melo AM, Kaufmann P, Giménez de Castro CG, Raulin J, Levato H, Marun A, Giuliani JL, Pereyra P (2005) IEEE Trans Antennas Propag 53:1528

    ADS  Google Scholar 

  • Melnikov VF, Costa JER, Simoes PJA (2013) Solar Phys, in preparation

  • Murphy RJ, Dermer CD, Ramaty R (1987) Astrophys J Suppl Ser 63:721

    ADS  Google Scholar 

  • Nita GM, Gary DE, Lee J (2004) Astrophys J 605:528

    ADS  Google Scholar 

  • Pacholczyk AG (1970) Radio astrophysics. Freeman, San Francisco

    Google Scholar 

  • Qin Z, Li C, Fu Q, Gao Z (1996) Sol Phys 163:383

    ADS  Google Scholar 

  • Ramaty R, Schwartz RA, Enome S, Nakajima H (1994) Astrophys J 436:941

    ADS  Google Scholar 

  • Raulin J, Kaufmann P, Olivieri R, Correia E, Makhmutov VS, Magun A (1998) Astrophys J Lett 498:L173

    ADS  Google Scholar 

  • Raulin J, Vilmer N, Trottet G, Nitta N, Silva AVR, Kaufmann P, Correia E, Magun A (2000) Astron Astrophys 355:355

    ADS  Google Scholar 

  • Raulin JP, Kaufmann P, Giménez de Castro CG, Pacini A-A, Makhmutov VS, Levato H, Rovira M (2003) Astrophys J 592:580

    ADS  Google Scholar 

  • Raulin JP, Makhmutov VS, Kaufmann P, Pacini AA, Lüthi T, Hudson HS, Gary DE (2004) Sol Phys 223:181

    ADS  Google Scholar 

  • Raymond JC, Holman G, Ciaravella A, Panasyuk A, Ko Y, Kohl J (2007) Astrophys J 659:750

    ADS  Google Scholar 

  • Rybicki GB, Lightman AP (1985). In: Rybicki GB, Lightman AP (ed) Radiative processes in astrophysics

    Google Scholar 

  • Sakai JI, Nagasugi Y (2007a) Astron Astrophys 474:L33

    ADS  Google Scholar 

  • Sakai JI, Nagasugi Y (2007b) Astron Astrophys 470:1117

    ADS  Google Scholar 

  • Sakai JI, Nagasugi Y, Saito S, Kaufmann P (2006) Astron Astrophys 457:313

    ADS  Google Scholar 

  • Share GH, Murphy RJ, Smith DM, Schwartz RA, Lin RP (2004) Astrophys J Lett 615:L169

    ADS  Google Scholar 

  • Shibasaki K, Enome S, Nakajima H, Nishio M, Takano T, Hanaoka Y, Torii C, Sekiguchi H, Kawashima S, Bushimata T, Shinohara N, Koshiishi H, Shiomi Y, Irimajiri Y, Leka KD, Canfield RC (1994) Publ Astron Soc Jpn 46:L17

    ADS  Google Scholar 

  • Shimabukuro FI (1972) Solar Phys 23:169

    ADS  Google Scholar 

  • Silva ARV, Laganá T, Giménez de Castro CG, Kaufmann P, Costa JER, Levato H, Rovira M (2005) Sol Phys 227:265

    ADS  Google Scholar 

  • Silva AVR, Share GH, Murphy RJ, Costa JER, de Castro CGG, Raulin J, Kaufmann P (2007) Sol Phys 245:311

    ADS  Google Scholar 

  • Slottje C (1978) Nature 275:520

    ADS  Google Scholar 

  • Stähli M, Gary DE, Hurford GJ (1989) Sol Phys 120:351

    ADS  Google Scholar 

  • Staehli M, Magun A, Schanda E (1987) Sol Phys 111:181

    ADS  Google Scholar 

  • Treumann RA (2006) Astron Astrophys Rev 13:229

    ADS  Google Scholar 

  • Trottet G, Krucker S, Lüthi T, Magun A (2008) Astrophys J 678:509

    ADS  Google Scholar 

  • Trottet G, Raulin J, Kaufmann P, Siarkowski M, Klein K, Gary DE (2002) Astron Astrophys 381:694

    ADS  Google Scholar 

  • Trottet G, Raulin J-P, Giménez de Castro G, Lüthi T, Caspi A, Mandrini CH, Luoni ML, Kaufmann P (2011) Sol Phys 273:339

    ADS  Google Scholar 

  • Trottet G, Rolli E, Magun A, Barat C, Kuznetsov A, Sunyaev R, Terekhov O (2000) Astron Astrophys 356:1067

    ADS  Google Scholar 

  • Trottet G, Vilmer N, Barat C, Benz A, Magun A, Kuznetsov A, Sunyaev R, Terekhov O (1998) Astron Astrophys 334:1099

    ADS  Google Scholar 

  • Tsuneta S, Ichimoto K, Katsukawa Y, Nagata S, Otsubo M, Shimizu T, Suematsu Y, Nakagiri M, Noguchi M, Tarbell T, Title A, Shine R, Rosenberg W, Hoffmann C, Jurcevich B, Kushner G, Levay M, Lites B, Elmore D, Matsushita T, Kawaguchi N, Saito H, Mikami I, Hill LD, Owens JK (2008) Sol Phys 249:167

    ADS  Google Scholar 

  • Tsytovich VN, Stenflo L, Wilhelmsson H (1975) Phys Scr 11:251

    ADS  Google Scholar 

  • Turon PJ, Léna PJ (1970) Sol Phys 14:112

    ADS  Google Scholar 

  • Valio A, Kaufmann P, Giménez de Castro CG, (2013) Solar Phys 23

  • Vernazza JE, Avrett EH, Loeser R (1981) Astrophys J Suppl Ser 45:635

    ADS  Google Scholar 

  • Vilmer N, MacKinnon AL, Trottet G, Barat C (2003) Astron Astrophys 412:865

    ADS  Google Scholar 

  • Vilmer N, Trottet G, Barat C, Schwartz RA, Enome S, Kuznetsov A, Sunyaev R, Terekhov O (1999) Astron Astrophys 342:575

    ADS  Google Scholar 

  • Wang H (2009) Res Astron Astrophys 9:127

    ADS  Google Scholar 

  • White SM, Benz AO, Christe S, Fárník F, Kundu MR, Mann G, Ning Z, Raulin J-P, Silva Válio AVR, Saint-Hilaire P, Vilmer N, Warmuth A (2011) Space Sci Rev 159:225

    ADS  Google Scholar 

  • Woods TN, Kopp G, Chamberlin PC (2006) J Geophys Res 111:10

    Google Scholar 

  • Wu CS (1985) Space Sci Rev 41:215

    ADS  Google Scholar 

  • Zheleznyakov VV (1967) Sov Phys JETP 24:381

    ADS  Google Scholar 

  • Zirin H, Wang H (1993) Nature 363:426

    ADS  Google Scholar 

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Acknowledgements

The authors thank the International Space Science Institute (ISSI), Bern, Switzerland, for supporting the preparation of this review. We also would like to thank the anonymous referee for his comments, which helped to improve our review.

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Krucker, S., Giménez de Castro, C.G., Hudson, H.S. et al. Solar flares at submillimeter wavelengths. Astron Astrophys Rev 21, 58 (2013). https://doi.org/10.1007/s00159-013-0058-3

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Keywords

  • Sun: flares
  • Sun: radio observations