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Microflares and nanoflares in the solar coron

†  a, b, ‡  a, §  a, *  a, #  a
a Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
b Samara National Research University, Moskovskoe sh. 34, Samara, 443086, Russian Federation

Due to the increase in the spatial and temporal resolution of observations of the solar atmosphere, which is mainly associated with progress in space research, we now understand that the Sun's activity not only is associated with large centers, but also extends to significantly smaller scales. Each new advance in experimental technology over the past 60 years has led to the discovery of more and more numerous and small solar structures: X-ray active regions in the 1960s, hot X-ray points in the 1970s, solar microflares in the 1980s, and finally, from the end of the 20th century, solar nanoflares. At the same time, the total energy release, obtainable from observations, is still insufficient to ensure a balance between heating of the corona and its rapid radiative cooling. For the smallest-scale phenomena, nanoflares, it is still not possible to resolve their structure and mechanism, which raises the question of whether it is correct to classify them as flares. We present a review of the main results obtained so far in the field of small-scale solar activity, mainly microflares and nanoflares, and discuss the main issues that need to be solved in order to move forward.

Fulltext pdf (882 KB)
Fulltext is also available at DOI: 10.3367/UFNe.2019.06.038769
Keywords: solar corona, solar activity, solar microflares, solar nanoflares, hot X-ray points, Ellerman bombs
PACS: 95.55.Ka, 96.60.−j, 96.60.Q−, 96.60.qe (all)
DOI: 10.3367/UFNe.2019.06.038769
URL: https://ufn.ru/en/articles/2020/8/f/
000583209000006
2-s2.0-85096317724
2020PhyU...63..783B
Citation: Bogachev S A, Ulyanov A S, Kirichenko A S, Loboda I P, Reva A A "Microflares and nanoflares in the solar coron" Phys. Usp. 63 783–800 (2020)
BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks

Received: 5th, June 2019, 5th, June 2019

Оригинал: Богачёв С А, Ульянов А С, Кириченко А С, Лобода И П, Рева А А «Микровспышки и нановспышки в короне Солнца» УФН 190 838–858 (2020); DOI: 10.3367/UFNr.2019.06.038769

References (211) ↓ Cited by (21) Similar articles (20)

  1. Parker E N Astrophys. J. 330 474 (1988)
  2. Parker E N Astrophys. J. 128 664 (1958)
  3. Withbroe G L, Noyes R W Annu. Rev. Astron. Astrophys. 15 363 (1977)
  4. Schwarzschild M Astrophys. J. 107 1 (1948)
  5. Stein R F, Leibacher J Annu. Rev. Astron. Astrophys. 12 407 (1974)
  6. Priest E R Solar Magnetohydrodynamics (Geophysics and Astrophysics Monographs) Vol. 21 (Dordrecht: Springer, 1982)
  7. Hollweg J V Solar Phys. 91 269 (1984)
  8. Davila J M Astrophys. J. 317 514 (1987)
  9. Aschwanden M J et al Astrophys. J. 520 880 (1999)
  10. De Pontieu B et al Science 318 1574 (2007)
  11. Nisticò G, Nakariakov V M, Verwichte E Astron. Astrophys. 552 A57 (2013)
  12. Okamoto T J et al Astrophys. J. 809 71 (2015)
  13. Réville V et al Astrophys. J. Suppl. 246 24 (2020)
  14. Parker E N Astrophys. J. 264 642 (1983)
  15. Somov B V, Syrovatskii S I Usp. Fiz. Nauk 120 217 (1976); Somov B V, Syrovatskii S I Sov. Phys. Usp. 19 813 (1976)
  16. Somov B V Plasma Astrophysics Pt. II Reconnection And Flares (Astrophysics and Space Science Library) Vol. 341 (New York: Springer-Verlag, 2007)
  17. Lin R P et al Astrophys. J. 283 421 (1984)
  18. Brown J C Solar Phys. 18 489 (1971)
  19. Syrovatskii S I, Shmeleva O P Astron. Zhurn. 49 334 (1972); Syrovatskii S I, Shmeleva O P Sov. Astron. 16 273 (1972)
  20. Porter J G et al Astrophys. J. 323 380 (1987)
  21. Blake R L et al Astrophys. J. 137 3 (1963)
  22. Friedman H The Solar Corona. Proc. Of Intern. Astronomical Union Symp., Cloudcroft, New Mexico, USA, 28 - 30 August 1961 (IAU Symp.) Vol. 16 (Ed. J W Evans) (New York: Academic Press, 1963) p. 45
  23. Mandel’štam S L Space Sci. Rev. 4 587 (1965)
  24. Beigman I L et al Solar Phys. 9 160 (1969)
  25. Golub L et al Astrophys. J. 189 L93 (1974)
  26. Golub L et al Solar Phys. 53 111 (1977)
  27. Canfield R C, Metcalf T R Astrophys. J. 321 586 (1987)
  28. Hudson H S Solar Phys. 133 357 (1991)
  29. Vaiana G S, Rosner R Annu. Rev. Astron. Astrophys. 16 393 (1978)
  30. Krucker S et al Astrophys. J. 488 499 (1997)
  31. Tsuneta S et al Solar Phys. 136 37 (1991)
  32. Berghmans D, Clette F, Moses D Astron. Astrophys. 336 1039 (1998)
  33. Delaboudinière J-P et al Solar Phys. 162 291 (1995)
  34. Krucker S, Benz A O Astrophys. J. 501 L213 (1998)
  35. Aschwanden M J et al Astrophys. J. 535 1047 (2000)
  36. Handy B N et al Solar Phys. 187 229 (1999)
  37. Rosner R, Tucker W H, Vaiana G S Astrophys. J. 220 643 (1978)
  38. Aschwanden M J Solar Phys. 190 233 (1999)
  39. Kuzin S V i dr Astron. Vestn. 45 166 (2011); Kuzin S V et al Solar Syst. Res. 45 162 (2011)
  40. Ul’yanov A S i dr Astron. Zhurn. 45 290 (2019); Ulyanov A S et al Astron. Lett. 45 248 (2019)
  41. Parnell C C, Jupp P E Astrophys. J. 529 554 (2000)
  42. Benz A O, Krucker S Astrophys. J. 568 413 (2002)
  43. Aschwanden M J, Parnell C E Astrophys. J. 572 1048 (2002)
  44. Saint-Hilaire P, Benz A O Astron. Astrophys. 435 743 (2005)
  45. Tsuneta S et al Astrophys. J. 478 787 (1997)
  46. Hannah I G et al Astron. Astrophys. 481 L45 (2008)
  47. Glesener L et al Astrophys. J. Lett. 891 L34 (2020)
  48. Feldman U et al Astrophys. J. 460 1034 (1996)
  49. Culhane J L et al Solar Phys. 136 89 (1991)
  50. Garcia H A Astrophys. J. 420 422 (1994)
  51. Battaglia M, Grigis P C, Benz A O Astron. Astrophys. 439 737 (2005)
  52. Lin R P et al Solar Phys. 210 3 (2002)
  53. Schwartz R "Compton Gamma Ray Observatory Phase 4 Guest Investigator Program: Solar flare hard X-ray spectroscopy" Technical Report (Greenbelt, MD: NASA Goddard Space Flight Center Greenbelt, Lab. for Astronomy and Solar Physics, 1996)
  54. Smith D M et al Solar Phys. 210 33 (2002)
  55. Hannah I G et al Astrophys. J. 677 704 (2008)
  56. Dere K P et al Astron. Astrophys. Suppl. Ser. 125 149 (1997)
  57. Landi E et al Astrophys. J. Suppl. 162 261 (2006)
  58. Li Y P, Gan W Q, Feng L Astrophys. J. 747 133 (2012)
  59. White S M, Thomas R J, Schwartz R A Solar Phys. 227 231 (2005)
  60. Ryan D F et al Astrophys. J. Suppl. 202 11 (2012)
  61. Caspi A, Krucker S, Lin R P Astrophys. J. 781 43 (2014)
  62. Kirichenko A S, Bogachev S A Astrophys. J. 840 45 (2017)
  63. Sylwester J et al J. Astrophys. Astron. 29 339 (2008)
  64. Kuzin S V et al Adv. Space Res. 43 1001 (2009)
  65. Kotov Yu D Astron. Vestn. 45 99 (2011); Kotov Yu D Solar Syst. Res. 45 93 (2011)
  66. Landi E et al Astrophys. J. 711 75 (2010)
  67. Garcia H A, McIntosh P S Solar Phys. 141 109 (1992)
  68. Lemen J R et al Solar Phys. 275 17 (2012)
  69. Ul’yanov A S, Bogachev S A, Kuzin S V Astron. Zhurn. 87 1030 (2010); Ulyanov A S, Bogachev S A, Kuzin S V Astron. Rep. 54 948 (2010)
  70. De Pontieu B et al Solar Phys. 289 2733 (2014)
  71. Kobayashi K et al Solar Phys. 289 4393 (2014)
  72. Merzlyakov V L Geomagn. Aeron. 57 1063 (2017)
  73. Loboda I P, Bogachev S A Solar Phys. 290 1963 (2015)
  74. Loboda I P, Bogachev S A Astron. Astrophys. 597 A78 (2017)
  75. Loboda I P, Bogachev S A Astrophys. J. 871 230 (2019)
  76. Priest E R, Forbes T G Astron. Astrophys. Rev. 10 313 (2002)
  77. Aschwanden M J Particle Acceleration And Kinematics In Solar Flares (Dordrecht: Springer, 2002)
  78. Parker E N Astrophys. J. 174 499 (1972)
  79. Parker E N Astrophys. J. 264 635 (1983)
  80. Wilmot-Smith A L, Pontin D I, Hornig G Astron. Astrophys. 516 A5 (2010)
  81. Pontin D I et al Astron. Astrophys. 525 A57 (2011)
  82. Yeates A R et al Astron. Astrophys. 564 A131 (2014)
  83. Hansteen V et al Astrophys. J. 811 106 (2015)
  84. Pontin D I et al Plasma Phys. Control. Fusion 58 054008 (2016)
  85. Knizhnik K J et al Astrophys. J. 853 82 (2018)
  86. Cargill P J Space Sci. Rev. 144 413 (2009)
  87. Wiegelmann T, Thalmann J K, Solanki S K Astron. Astrophys. Rev. 22 78 (2014)
  88. Fleishman G D et al Science 367 278 (2020)
  89. Cirtain J W et al Nature 493 501 (2013)
  90. Winebarger A R et al Astrophys. J. Lett. 787 L10 (2014)
  91. Thalmann J K, Tiwari S K, Wiegelmann T Astrophys. J. 780 102 (2014)
  92. Pant V, Datta A, Banerjee D Astrophys. J. Lett. 801 L2 (2015)
  93. Pontin D I et al Astrophys. J. 837 108 (2017)
  94. Del Zanna G Astron. Astrophys. 558 A73 (2013)
  95. Aschwanden M J Astrophys. J. 874 131 (2019)
  96. Brooks D H et al Astrophys. J. Lett. 772 L19 (2013)
  97. Priest E R, Chitta L P, Syntelis P Astrophys. J. Lett. 862 L24 (2018)
  98. Syntelis P, Priest E R, Chitta L P Astrophys. J. 872 32 (2019)
  99. Syntelis P, Priest E R Astrophys. J. 891 52 (2020)
  100. Smitha H N et al Astrophys. J. Suppl. 229 17 (2017)
  101. Tiwari S K et al Astrophys. J. Lett. 795 L24 (2014)
  102. Ellerman F Astrophys. J. 46 298 (1917)
  103. Pariat E et al Astron. Astrophys. 473 279 (2007)
  104. Watanabe H et al Astrophys. J. 736 71 (2011)
  105. Hong J et al Astrophys. J. 792 13 (2014)
  106. Kitai R Solar Phys. 87 135 (1983)
  107. Fang C et al Astrophys. J. 643 1325 (2006)
  108. Rezaei R, Beck C Astron. Astrophys. 582 A104 (2015)
  109. Reid A et al Astrophys. J. 823 110 (2016)
  110. Georgoulis M K et al Astrophys. J. 575 506 (2002)
  111. Vissers G J M et al Astrophys. J. 774 32 (2013)
  112. Peter H et al Science 346 1255726 (2014)
  113. Kim Y-H et al Astrophys. J. 810 38 (2015)
  114. Libbrecht T et al Astron. Astrophys. 598 A33 (2017)
  115. Rutten R J et al J. Phys. Conf. Ser. 440 012007 (2013)
  116. Vissers G J M et al Astrophys. J. 812 11 (2015)
  117. Hansteen V H et al Astrophys. J. 839 22 (2017)
  118. Reid A et al Astrophys. J. Lett. 118 A37 (2017)
  119. Schmieder B et al Astrophys. J. 601 530 (2004)
  120. Bello González N, Danilovic S, Kneer F Astron. Astrophys. 557 A102 (2013)
  121. Pariat E et al Astrophys. J. 614 1099 (2004)
  122. Pariat E et al Adv. Space Res. 38 902 (2006)
  123. Nelson C J et al Astrophys. J. 779 125 (2013)
  124. Nelson C J et al Astrophys. J. 798 19 (2015)
  125. Diver D A, Brown J C, Rust D M Solar Phys. 168 105 (1996)
  126. Danilovic S Astron. Astrophys. 601 A122 (2017)
  127. Parker E N Astrophys. J. 145 811 (1966)
  128. Magara T Astrophys. J. 549 608 (2001)
  129. Isobe H, Tripathi D, Archontis V Astrophys. J. Lett. 657 L53 (2007)
  130. Archontis V, Hood A W Astron. Astrophys. 508 1469 (2009)
  131. Litvinenko Yu E Astrophys. J. 515 435 (1999)
  132. Madjarska M S Living Rev. Sol. Phys. 16 2 (2019)
  133. Vaiana G S et al Astrophys. J. 185 L47 (1973)
  134. Kankelborg C C et al Astrophys. J. 466 529 (1996)
  135. Brown D S et al Solar Phys. 201 305 (2001)
  136. Chandrashekhar K et al Solar Phys. 286 125 (2013)
  137. Habbal S R et al Astrophys. J. 306 740 (1986)
  138. Fu Q, Kundu M R, Schmahl E J Solar Phys. 108 99 (1987)
  139. Habbal S R, Harvey K L Astrophys. J. 326 988 (1988)
  140. Nitta N et al Publ. Astron. Soc. Jpn. 44 L167 (1992)
  141. Habbal S R, Dowdy J F (Jr.), Withbroe G L Astrophys. J. 352 333 (1990)
  142. Zhang J, Kundu M R, White S M Solar Phys. 198 347 (2001)
  143. Alipour N, Safari H Astrophys. J. 807 175 (2015)
  144. Sheeley N R (Jr.), Golub L Solar Phys. 63 119 (1979)
  145. Kotoku J et al Publ. Astron. Soc. Jpn. 59 S735 (2007)
  146. Pérez-Suárez D et al Astrophys. 492 575 (2008)
  147. Mou C et al Astrophys. J. 818 9 (2016)
  148. Golub L, Krieger A S, Vaiana G S Solar Phys. 49 79 (1976)
  149. Hirzberger J et al Solar Phys. 251 417 (2008)
  150. Alexander C E, Del Zanna G, Maclean R C Astron. Astrophys. 526 A134 (2011)
  151. Kariyappa R et al Astron. Astrophys. 526 A78 (2011)
  152. Habbal S R, Grace E Astrophys. J. 382 667 (1991)
  153. Brosius J W et al Astrophys. J. 677 781 (2008)
  154. Doschek G A et al Astrophys. J. 710 1806 (2010)
  155. Nolte J T, Solodyna C V, Gerassimenko M Solar Phys. 63 113 (1979)
  156. Preś P, Phillips K H J Astrophys. J. 510 L73 (1999)
  157. Madjarska M S et al Astron. Astrophys. 398 775 (2003)
  158. Ugarte-Urra I et al Astron. Astrophys. 418 313 (2004)
  159. Tian H, Xia L-D, Li S Astron. Astrophys. 489 741 (2008)
  160. Habbal S R, Withbroe G L Solar Phys. 69 77 (1981)
  161. Strong K T et al Publ. Astron. Soc. Jpn. 44 L161 (1992)
  162. Kayshap P, Dwivedi B N Solar Phys. 292 108 (2017)
  163. Zhang P, Fang C, Zhang Q Sci. China Phys. Mech. Astron. 55 907 (2012)
  164. Kankelborg C C, Walker A B C (II), Hoover R B Astrophys. J. 491 952 (1997)
  165. Mandrini C H et al Solar Phys. 168 115 (1996)
  166. Krieger A S, Vaiana G S, van Speybroeck L P Solar Magnetic Fields (IAU Symp.) Vol. 43 (Ed. R Howard) (Dordrecht: Springer, 1971) p. 397
  167. Vaiana G S, Krieger A S, Timothy A F Solar Phys. 32 81 (1973)
  168. Tang F et al Adv. Space Res. 2 (11) 65 (1982)
  169. Harvey K L et al Solar Active Region Evolution: Comparing Models with Observations. Proc. of the 14th Intern. Summer Workshop, Sunspot, New Mexico, USA, 30 August - 3 September 1993 (Astronomical Society of the Pacific Conf. Ser.) Vol. 68 (Eds K S Balasubramaniam, G W Simon) (San Francisco, CA: Astronomical Society of the Pacific, 1994) p. 377
  170. Galsgaard K et al Astron. Astrophys. 606 A46 (2017)
  171. Longcope D W et al Astrophys. J. 553 429 (2001)
  172. Harvey K L et al Adv. Space Res. 13 (9) 27 (1993)
  173. Webb D F et al Solar Phys. 144 15 (1993)
  174. Parnell C E, Priest E R, Titov V S Solar Phys. 153 217 (1994)
  175. Parnell C E, Priest E R, Golub L Solar Phys. 151 57 (1994)
  176. Priest E R, Parnell S E, Martin S F Astrophys. J. 427 459 (1994)
  177. Van Driel-Gesztelyi L et al Solar Phys. 163 145 (1996)
  178. Kontogiannis I et al Astron. Astrophys. 633 A67 (2020)
  179. Longcope D W Astrophys. J. 507 433 (1998)
  180. McIntosh S W Astrophys. J. 670 1401 (2007)
  181. Hui T et al Astrophys. J. 681 L121 (2008)
  182. Ulyanov A S et al Solar Phys. 294 128 (2019)
  183. Bogachev S A et al Astrophys. J. 630 561 (2005)
  184. Craig I J D, Sneyd A D Astrophys. J. 311 451 (1986)
  185. Golub L et al Solar Phys. 243 63 (2007)
  186. Reale F et al Astrophys. J. Lett. 736 L16 (2011)
  187. Warren H P, Winebarger A R, Brooks D H Astrophys. J. 759 141 (2012)
  188. Testa P, Reale F Astrophys. J. Lett. 750 L10 (2012)
  189. Reale F et al Astrophys. J. 698 756 (2009)
  190. Schmelz J T et al Astrophys. J. 704 863 (2009)
  191. Schmelz J T et al Astrophys. J. 693 L131 (2009)
  192. Testa P et al Astrophys. J. 728 30 (2011)
  193. Winebarger A R et al Astrophys. J. Lett. 746 L17 (2012)
  194. Hannah I G et al Astrophys. J. Lett. 820 L14 (2016)
  195. Harrison F A et al Astrophys. J. 770 103 (2013)
  196. Ishikawa S et al Publ. Astron. Soc. Jpn. 66 S15 (2014)
  197. Krucker S et al Astrophys. J. Lett. 793 L32 (2014)
  198. Del Zanna G, Mason H E Astron. Astrophys. 565 A14 (2014)
  199. Miceli M et al Astron. Astrophys. 544 A139 (2012)
  200. Gburek S i dr Astron. Vestn. 45 195 (2011); Gburek S et al Solar Syst. Res. 45 189 (2011)
  201. Sylwester B, Sylwester J, Phillips K J H Astron. Astrophys. 514 A82 (2010)
  202. Sylwester J et al Solar Phys. 226 45 (2005)
  203. Reva A et al Solar Phys. 293 140 (2018)
  204. Parenti S et al Astrophys. J. 846 25 (2017)
  205. Wilhelm K et al Solar Phys. 162 189 (1995)
  206. Brosius J W, Daw A N, Rabin D M Astrophys. J. 790 112 (2014)
  207. Oraevskii V N, Sobel’man I I Pis’ma Astron. Zhurn. 28 457 (2002); Oraevsky V N, Sobelman I I Astron. Lett. 28 401 (2002)
  208. Cargill P J Astrophys. J. 784 49 (2014)
  209. Kuznetsov V D et al Geomagn. Aeron. 56 781 (2016)
  210. Kuzin S V i dr Izv. RAN Ser. Fiz. 75 91 (2011); Kuzin S V et al Bull. Russ. Acad. Sci. Phys. 75 87 (2011)
  211. Vishnyakov E A et al Proc. SPIE 10235 102350B (2017)
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