THE SOLAR SURFACE DIFFERENTIAL ROTATION FROM DISK-INTEGRATED CHROMOSPHERIC FLUXES

被引:31
作者
DONAHUE, RA [1 ]
KEIL, SL [1 ]
机构
[1] NATL SOLAR OBSERV,SUNSPOT,NM 88349
关键词
D O I
10.1007/BF00733031
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Disk-integrated solar chromospheric Ca II K-line (3933.68 Angstrom) fluxes have been measured almost daily at Sacramento Peak Observatory since 1977. Using observing windows selected to mimic seasonal windows for chromospheric measurements of lower Main-Sequence stars such as those observed by Mount Wilson Observatory's HK Project, we have measured the solar rotation from the modulation of the Ca it K-line flux. We track the change of rotation period from the decline of cycle 21 through the maximum of cycle 22. This variation in rotation period is shown to behave as expected from the migration of active regions in latitude according to Maunder's 'butterfly diagram', including an abrupt change in rotation period at the transition from cycle 21 to cycle 22. These results indicate the successful detection of solar surface differential rotation from disk-integrated observations. We argue that the success of our study compared to previous investigations of the solar surface differential rotation from disk-integrated fluxes lies primarily with the choice of the length of the time-series window. Our selection of 200 days is shorter than in previous studies whose windows are typically on the order of one year. The 200-day window is long enough to permit an accurate determination of the rotation period, yet short enough to avoid complications arising from active region evolution. Thus, measurements of the variation of rotation period in lower Main-Sequence stars, especially those that appear to be correlated with long-term changes in chromospheric activity (i.e., cycles), are probably evidence for stellar surface differential rotation.
引用
收藏
页码:53 / 62
页数:10
相关论文
共 33 条
  • [1] Allen C.W., 1973, ASTROPHYSICAL QUANTI
  • [2] EVIDENCE FOR LONG-TERM BRIGHTNESS CHANGES OF SOLAR-TYPE STARS
    BALIUNAS, S
    JASTROW, R
    [J]. NATURE, 1990, 348 (6301) : 520 - 523
  • [3] STELLAR ROTATION IN LOWER MAIN-SEQUENCE STARS MEASURED FROM TIME VARIATIONS IN H AND K EMISSION-LINE FLUXES .2. DETAILED ANALYSIS OF THE 1980 OBSERVING SEASON DATA
    BALIUNAS, SL
    VAUGHAN, AH
    HARTMANN, L
    MIDDELKOOP, F
    MIHALAS, D
    NOYES, RW
    PRESTON, GW
    FRAZER, J
    LANNING, H
    [J]. ASTROPHYSICAL JOURNAL, 1983, 275 (02) : 752 - 772
  • [4] CHROMOSPHERIC VARIATIONS IN MAIN-SEQUENCE STARS .2.
    BALIUNAS, SL
    DONAHUE, RA
    SOON, WH
    HORNE, JH
    FRAZER, J
    WOODARDEKLUND, L
    BRADFORD, M
    RAO, LM
    WILSON, OC
    ZHANG, Q
    BENNETT, W
    BRIGGS, J
    CARROLL, SM
    DUNCAN, DK
    FIGUEROA, D
    LANNING, HH
    MISCH, A
    MUELLER, J
    NOYES, RW
    POPPE, D
    PORTER, AC
    ROBINSON, CR
    RUSSELL, J
    SHELTON, JC
    SOYUMER, T
    VAUGHAN, AH
    WHITNEY, JH
    [J]. ASTROPHYSICAL JOURNAL, 1995, 438 (01) : 269 - 287
  • [5] TIME-SERIES MEASUREMENTS OF CHROMOSPHERIC CA-II H-EMISSION AND K-EMISSION IN COOL STARS AND THE SEARCH FOR DIFFERENTIAL ROTATION
    BALIUNAS, SL
    HORNE, JH
    PORTER, A
    DUNCAN, DK
    FRAZER, J
    LANNING, H
    MISCH, A
    MUELLER, J
    NOYES, RW
    SOYUMER, D
    VAUGHAN, AH
    WOODARD, L
    [J]. ASTROPHYSICAL JOURNAL, 1985, 294 (01) : 310 - 325
  • [6] RECURRENCE OF SOLAR-ACTIVITY - EVIDENCE FOR ACTIVE LONGITUDES
    BOGART, RS
    [J]. SOLAR PHYSICS, 1982, 76 (01) : 155 - 165
  • [7] Carrington R. C., 1858, MNRAS, V19, P1
  • [8] Carrington R. C., 1863, OBSERVATIONS SPOTS S
  • [9] DOBSON AK, 1990, PASP C SERIES, V9, P132
  • [10] EVIDENCE OF DIFFERENTIAL SURFACE ROTATION IN THE SOLAR-TYPE STAR HD-114710
    DONAHUE, RA
    BALIUNAS, SL
    [J]. ASTROPHYSICAL JOURNAL, 1992, 393 (02) : L63 - L66