SOLAR EVENT LISTS

Listed here are various surveys that I have made of the based on the Yohkoh SXT data. They generally cover the declining phase of solar cycle 21, i.e. September 1991 through early 1995. By that time the sun had cooled to the extent that very little was visible with SXT. Also linked here are some lists collected from other people of SXT events, and a few related lists.

• An SXT master event list. This list includes all types of events, with dates, and brief descriptions of the type of events. This list covers from September 1991 through early 1995. This list has generally been superceeded by the statistical lists below. There are 429 events.

  Event Sublists:

  • A list of arcade events with the arches and tails structure. Covers September 1991 through August 1992. 50 events listed.

  • A list of large southern coronal arcade events. From January 1992 through March 1994. 32 events listed.

  • A list of Ebi-like events. I.e. events similar to the May 7, 1992 arcade event. Covers September 1991 through August 1992. 27 events listed.

  • A list of helmet events, especially "tied" helmets, where the top of the helmet seems to attach back to the surface, or some other structure. Covers January through July 1992. 13 events listed.

  • A list of expansion events. These are events (mostly over the limbs) in which the expansion or eruption/ejection of active region loops is observable. Covers November 1991 through August 1992. 18 events listed.

  • Notes on the SXT events for a list of Helium 10830 2-ribbon events received from K. Harvey. September 1991 to April 1992. 14 events.

  SXT Event Surveys: Statistical

  Note that the various top level survey lists have not been consolidated. Since the later ones (below the arcade surveys) usually started from the master survey (immediatley below) there is some overlap, but no complete master list has been produced.

• The Coronal event master survey. This contains SXT "events" of all sorts, though mainly of eruptive nature, ie. arcades, active region eruptions, and quiet sun large scale coronal changes. It covers from launch through early 1995.
  This list includes mainly statistics, e.g. time, location, relation to neutral lines, streamers, and coronal holes, rotation. Events are classified in a few words, e.g. arcade, filamentary, diffuse, etc. Note is made of other observations, e.g. filament eruptions, CMEs etc.
  There are 597 entries.

  Coronal Event sub-lists:

  • The CME list is a subset of more certain CME signatures, mainly medium and large scale arcades. It is the main list for the arcade location study and has been checked against the SXT movie 2 or 3 times. It covers 18 months from Januray 1993 through June 1994. There are 242 events.

    CME List sub-lists:

    • The Large arcade list includes only the largest arcades, e.i. those with an estimated width of 20 degrees or more. These are the events best associated with the streamer belts and with CMEs. There are 87 events.

      Large Arcade sub-lists:

      • Large arcades on the front side of the sun, i.e. appearing at least partially on the disk. There are 48 events.

      • Large arcades around central meridian. These all impinge on the lonitudes between E 45 and W 45 degrees. There are 28 events.

  • A survey of Rotation in dynamic arcade events. In dynamic events the skew of the arcades some times changes with time, always decreasing with height. It is either clockwise or counter-clockwise depending on the overall skew of the arcade/streamer structure. Most arcades do not have a clear sense of rotation. The survey covers from September 1991 to early 1995. It is reasonably complete, but was compiled incidentaly to other surveys. Careful and systematic observation might be able to expand the list somewhat. There are 36 events listed.

• The observed Skew of arcades over large Ha filaments. Based on S. Martin's survey of large filaments in January through June of 1992. Out of 68 filaments there are 34 cases in which arcade skew was also observable. This is based mainly on static aracdes, though occasional dynamic arcades were also used. Revised from earlier skew.list.

• A survey of High-latitude Skew. Focused on the polar crowns, but also making note of switchback and other mid-latitude neutral lines, this list covers from September 1991 through August 1994. These include both arcade observations, static and dynamic, and filamentary or axial loops. There are 312 entries.

• A survey of x-ray Filaments, both quasi-static and transient. These are generally axial, i.e. lying roughly along a neutral line. It does not include single loops that are probably parts of arcades, or between active regions ect. The survey covers from September 1991 through June 1994. There 96 events listed.

• A survey of Dimmings. These are transient darkenings usually associated with arcade and eruptive events. It covers from September 1991 through early 1995. Dimming types, and timings are listed, as are overall event type and the existance of other observations, e.g. filament disappearences. There are 113 events.

• A list of Holey Roller events. These are moving dimmings associated with eruptive coronal events. The list covers up to July 1994. There are 14 events.

  Other SXT Event Lists

• Kano's list of dynamic arcade events from 1991 and the first half of 1992. Note is made of initial `strings' and other geometrical features. Some notes are attached. There are 27 events.

• A list of Ohyama's arcade events. It covers 1991 and the first half of 1992. There are 38 listings.

• A list of a few events for the semi-eruptive study. These are based on observations of erupting/non-erupting prominences. Notes on SXT and Mauna Loa observations are given. There are 8 events.

  Other Event Lists

• A listing of Mauna Loa Mark-III white light mass ejections during the Yohkoh period of observations (October 1991 through September 1995). [This should probably be updated.]
• A list of Ulysses CMEs culled from the literature, with extensive notes on relation ships to associated solar and terrestrial activity. 10 cases listed.

• A combined list of geo-effective events. Based on solar, terrestrial, and interplanetary sources (SXT disk CME sources, Kp storms, and Ulysses ICME observations).

Last updated December 9, 1997. © Alan McAllister