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  1. No Access

    Article

    Filament Disappearances During the Period of September 1991 through September 1994

    Continuous full-disk Hα images recorded by the Big Bear Solar Observatory (BBSO) from 1 September 1991 to 19 September 1994 (the first three years of Yohkoh mission) were digitized and analyzed. The data set c...

    Haimin Wang, Arkadiusz E. Komenda, Frances Tang, Hal Zirin in Solar Physics (1998)

  2. No Access

    Article

    Flux distribution of solar intranetwork magnetic fields

    Big Bear deep magnetograms of June 4, 1992 provide unprecedented observations for direct measurements of solar intranetwork (IN) magnetic fields. More than 2500 individual IN elements and 500 network elements ...

    **gxiu Wang, Haimin Wang, Frances Tang, Jeongwoo W. Lee, Harold Zirin in Solar Physics (1995)

  3. No Access

    Article

    Polar fields during the rising phase of cycle 22

    High-resolution magnetograph observations of the polar magnetic fields have been obtained at intervals of time since the end of 1986 at Big Bear Solar Observatory. The Big Bear data differ from the low-resolut...

    Frances Tang, Haimin Wang in Solar Physics (1991)

  4. No Access

    Article

    X-ray bright surges

    We present evidence of X-ray emission from surges that are bright in Hα. These surges have many features common to flaring arches of Martin and Švestka (1988); the basic difference between the two is that in flar...

    Zdeněk Švestka, František Fárník, Frances Tang in Solar Physics (1990)

  5. No Access

    Article

    Quiescent prominences - where are they formed?

    A survey of two years (1973 and 1979) of quiescent prominences reveals that substantially more (20 and 96% more, respectively, in the two years surveyed) quiescent prominences were formed on neutral lines betw...

    Frances Tang in Solar Physics (1987)

  6. No Access

    Article

    The two types of flare-associated filament eruptions

    Using 15 years of high-resolution solar film obtained at Big Bear Solar Observatory we studied flare-associated filament eruptions. In addition to the ‘classical’ type eruption consisting of expansion and brea...

    Frances Tang in Solar Physics (1986)

  7. No Access

    Article

    Flare morphologies and coronal field configurations

    Chromospheric flares are the footpoints of closed coronal field lines. In this paper we present different flare morphologies from observations and examine the implied coronal field configurations above the fla...

    Frances Tang in Solar Physics (1985)

  8. No Access

    Article

    A statistical study of active regions 1967–1981

    We have studied 15 years of active region data based on the Mount Wilson daily magnetograms in the interval 1967–1981. The analysis revealed the following: (1) The integral number of regions decreases exponent...

    Frances Tang, Robert Howard, John M. Adkins in Solar Physics (1984)

  9. No Access

    Article

    On the origin of δ spots

    Mount Wilson sunspot drawings from 1966 through 1980 were used in conjunction with Hα filtergrams from Big Bear Solar Observatory to examine the origin of δ spots, spots with bipolar umbrae within one penumbra...

    Frances Tang in Solar Physics (1983)

  10. No Access

    Article

    Flare asymmetry as seen in offband Hα filtergrams

    Narrow-band Hα filtergrams at ±1 Å and ±2 Å from the line center were used to study the asymmetry of flares. Of the 60 flares studied, 92% show red asymmetry while 5% show blue asymmetry. Typically, the filtergra...

    Frances Tang in Solar Physics (1983)

  11. No Access

    Article

    Remote flare brightenings and type III reverse slope bursts

    We present two large flares which were exceptional in that each produced an extensive chain of Hα emission patches in remote quiet regions more than 105 km away from the main flare site. They were also unusual in...

    Frances Tang, R. L. Moore in Solar Physics (1982)

  12. No Access

    Article

    Reversed-polarity regions

    We present results of a statistical study of reversed-polarity regions, RPRs, collected over the past 11 years, 1969–1979.

    Frances Tang in Solar Physics (1982)

  13. No Access

    Article

    Rotation rate of high-latitude sunspots

    Rotation rate of 19 high latitude (28–44°) short-lived sunspots collected in 1978–1979 are compared with Newton and Nunn's (1951) recurrent spots rate. To reduce the effect of proper motion in spots of new reg...

    Frances Tang in Solar Physics (1981)

  14. No Access

    Article

    Umbral flares

    Hα flare patches usually do not occur in sunspot umbrae. Presented here are cases of a type of umbral flare in which the flare patch originated in, and was confined to, the p spot umbra. All are Hα subflares. Two...

    Frances Tang in Solar Physics (1978)

  15. No Access

    Article

    Differential rotation of short-lived solar filaments

    We have measured the rotation rate of short-lived solar filaments as a function of their latitude. The resulting rotation curve appears to be somewhat flatter than the corresponding curve for long-lived filame...

    W. M. Adams, Frances Tang in Solar Physics (1977)

  16. No Access

    Article

    Slow X-ray bursts and flares with filament disruption

    The data from OGO-5 and OSO-7 X-ray experiments have been compared with optical data from six chromospheric flares with filament disruption associated with slow thermal X-ray bursts. Filament activation accomp...

    Jean-René Roy, Frances Tang in Solar Physics (1975)

  17. No Access

    Article

    Umbral oscillations and penumbral waves in Hα

    We present examples of umbral oscillations observed on Big Bear Hα filtergram movies and investigate the relation between umbral oscillations and running penumbral waves occurring in the same sunspot. Umbral o...

    R. L. Moore, Frances Tang in Solar Physics (1975)