Tilts and polarity separation in the sunspot groups and active regions at the ascending and descending phases of the cycle 23

Advances in Space Research

Volumn 41, Issue 6, 2008, Pages 881-892

  Zharkova, V V ^a   Zharkov, S I ^b  

^a UNIVERSITY OF BRADFORD   (United Kingdom)

^b UNIVERSITY OF SHEFFIELD   (United Kingdom)

Author keywords

Sun: active regions; Sun: magnetic tilt; Sun: polarity separation; Sun: sunspot groups

Indexed keywords

CLASSIFICATION (OF INFORMATION); FUNCTION EVALUATION; SUN;

SUN: ACTIVE REGIONS; SUN: MAGNETIC TILT; SUN: POLARITY SEPARATION; SUN: SUNSPOT GROUPS;

SPACE RESEARCH;

EID: 39049141493     PISSN: 02731177     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.asr.2007.02.082     Document Type: Article

References (27)

1. Aboudarham, J., Zharkov, S.S. Feature parameters document. , EGSO-WP5-IR3-2.1, 28 p.
2. Benkhalil A.K., Zharkova V.V., Ipson S.S., and Zharkov S.I. Active Region Detection and Verification with the Solar Feature Catalogue. Solar Phys. 235 1/2 (2006) 87-106
3. Brunner W. Tilts in sunspot groups. Astron. Mitt. Zurich. (1930) 124
4. D'Silva S., and Choudhuri A.R. A theoretical model for tilts of bipolar magnetic regions. A&A 272 (1993) 621
5. Hale G.E., Ellerman F., Nickolson S.B., and Joy A.H. The magnetic polarity of Sun-spots. Astrophys. J. 49 (1919) 151
6. Holder Z., Canfield R.C., McMullen R.A., Nandy D., Howard A.F., and Pevtsov A.A. On the tilt and twist of solar active regions. Astrophys. J. 611 (2004) 1149
7. Howard R.F. The magnetic fields of active regions. VI - Magnetic axis tilt changes. Solar Phys. 132 (1991) 257
8. Howard R.F. Axial tilt angles of sunspot groups. Solar Phys. 136 (1991) 251
9. Howard R.F. Axial tilt angles of active regions and their polarity separations. Solar Phys. 145 (1993) 105
10. Fan, Y., Dynamic evolution of emerging magnetic flux tubes in the solar convective envelope. Ph.D. Thesis Hawaii University.
11. Fisher G.H., Fan Y., and Howard R.F. Comparisons between theory and observation of active region tilts. Solar Phys. 438 (1995) 463
12. Krivodubskij V.N. Astron. Nachr., AN 326 (2005) 61
13. Longcope D.W., Fisher G.H., and Pevtsov A.A. Flux-tube twist resulting from helical turbulence: the sigma-effect. Astrophys. J. 507 (1998) 417
14. Moss D., and Brooke J. Towards a model for the solar dynamo. MNRAS 315 (2001) 521
15. Muneer S., and Singh J. Axial tilt angles of active regions and their polarity separations. Solar Phys. 209 (2002) 321
16. Nandy N., and Choudhuri A.R. Toward a mean field formulation of the Babcock-Leighton type solar dynamo. I. Astrophys. J. 551 (2001) 576
17. Parker E.N. The formation of Sunspots from the solar toroidal field. Astrophys. J. 121 (1955) 491
18. Scherrer, P.H., Bogart, R.S., Bush, R.I. et al. and MDI Engineering team. The solar oscillations investigation - Michelson doppler imager. Solar Phys. 162, 129-188, 1995.
19. Wang Y.M., and Sheeley Jr. N.R. Average properties of bipolar magnetic regions during sunspot cycle 21. Solar Phys. 124 (1989) 81
20. Wang Y.M., and Sheeley Jr. N.R. On the fluctuating component of the Sun's large-scale magnetic field. Astrophys. J. 590 (2003) 1111
21. Zharkov S.I., and Zharkova V.V. Statistical analysis with SFC. Adv. Space Res. 38/5 (2006) 868
22. Zharkov S.I., Zharkova V.V., and Ipson S.S. Statistical properties of Sunspots in 1996-2004. 1. Detection, north-south asymmetry and area distribution. Solar Phys. 228/1 (2005) 401
23. Zharkov, S.I., Zharkova, V.V., Benkhalil, A.K. Statistical properties of the solar cycle 23 extracted from the solar feature catalogue. Proc. SPM11. ESA-600, 2005b.
24. Zharkov S.I., Gavryuseva E.V., and Zharkova V.V. The latitudinal distributions of sunspot areas and magnetic fields and their correlation with the background solar magnetic field in the cycle 23. Adv. Space Res. 39 11 (2007) 1753-1761
25. Zharkova V.V., Ipson S.S., Zharkov S.I., Benkhalil A., Aboudarham J., and Bentley R.D. A full disk image standardisation of the synoptic solar observations at the Meudon observatory. Solar Phys. 214 (2003) 89-105
26. Zharkova V.V., Ipson S.S., Zharkov S.I., Benkhalil A., Aboudarham J., and Fuller N. Solar feature catalogues in EGSO. Solar Phys. 228/1 (2005) 134
27. Zharkova V.V., Zharkov S.I., and Benkhalil A.K. North-South asymmetry in the solar cycle 23 extracted from the solar feature catalogues. Mem. S.A.It. 76 (2005) 1072