CDAW Data Center
Planetary Magnetospheres Branch (Code 695)
Laboratory for Extraterrestrial Physics
NASA / Goddard Space Flight Center
Greenbelt Maryland USA


Jan 18, 2011
  • Correction on CME masses and kinetic energies

    We have found an error in the processing of the LASCO mass images since mid-2003. The s/c 180 deg roll every 3 months was not being taken care of when the sector was selected for the mass measurement. This resulted in artificially lower masses which gave rise to the 6-month periodicity signal in our results.

    Nov 21, 2007
  • The Wind/WAVES Type II Burst Catalog Available Online


    The CDAW Data Center announces a new catalog of type II radio bursts detected by the Radio and Plasma Wave (WAVES) experiment on board the Wind spacecraft and the associated coronal mass ejections (CMEs) observed by the Solar and Heliospheric Observatory (SOHO). The catalog also contains information on the associated flares (X-ray importance, and NOAA active region number). The CME sources are also listed, as derived from the Solar Geophysical Data listing or from inner coronal images such as Yohkoh/SXT and SOHO/EIT. The type II bursts are also linked to Javascript movies made with the radio dynamic spectrum and SOHO/LASCO/EIT images. Finally, the type II bursts are linked to three-day overview plots of solar energetic particle events (protons in the >10, >50 and >100 MeV GOES channels), GOES soft X-ray light curves, and CME height-time history. The CMEs in this catalog are called radio-loud CMEs because of their ability to produce type II radio bursts. For questions and comments, please contact Nat Gopalswamy (gopals at ssedmail dot gsfc dot nasa dot gov). This work was supported by NASA's Virtual Observatories for Heliophysics Data Program.

    Dec 23, 2005
  • Recent Publications

    Coronal Mass Ejections of cycle 23
    N. Gopalswamy

    Major Scientific Results from SOHO on Coronal Mass Ejections
    N. Gopalswamy, B. Fleck and J. B. Gurman

    Workshop Highlights Progress in Solar-Heliospheric Physics
    N. Gopalswamy

    Long Lived Geomagnetic Storms and Coronal Mass Ejections
    H. Xie, N. Gopalswamy, P.K. Manoharan, A. Lara, S. Yashiro, and S. Lepri

    Type II Radio Bursts and Energetic Solar Eruptions
    N. Gopalswamy, E. Aguilar-Rodriguez, S. Yashiro, S. Nunes, M. L. Kaiser, and R. A. Howard

    Visibility of coronal mass ejections as a function of flare location and intensity
    S. Yashiro, N. Gopalswamy, S. Akiyama, G. Michalek, and R. A. Howard

    A Universal Characteristic of Type II Radio Bursts
    E. Aguilar-Rodriguez, N. Gopalswamy, R. MacDowall, S. Yashiro, and M. L. Kaiser

    Nov 7, 2005

  • ILWS Workshop: Second Announcement and Call for papers
  • ILWS Workshop
    The Solar Influence on the Heliosphere and Earth's Environment: Recent Progress and Prospects
    February 19-24, 2006 Goa, India

    On behalf of the Scientific Organizing Committee, we cordially invite you to participate in The International Living with a Star (ILWS) workshop to be held in Goa, India during February 19-24, 2006. The focus of the workshop will be on how the variable Sun influences the heliosphere around it and how the solar system objects respond. How Earth responds is of immediate concern to all nations of the world because of the increasing dependence on technology such as satellite communications. The ILWS workshop in Goa will bring an international focus to the solar-heliospheric and space weather issues and pave the way for increased collaboration among scientists. A major focus will be on various boundaries in the heliosphere. The workshop will consist of tutorial lectures, invited papers, and contributed papers (oral and posters). Apart from the tutorial talks and a few selected plenary talks, all the papers will be presented in the working group sessions. One important aspect of the ILWS workshop is that full papers should be submitted before the workshop (8 pages for invited papers and 4 pages for contributed papers). The workshop deliberations will take place on the following broad topics:

    Sun and the Heliosphere: Solar Interior-Surface; Solar Surface-Heliosphere; Solar Eruptions (CMEs and flares); Irradiance effects; Long-term change; Transient-Heliospheric effects; SEP production and transport; Cosmic rays in the heliosphere; Heliosphere-Magnetosphere

    Magnetosphere: Magnetopause; Sub-storms; Radiation belts; M-I coupling; Storms/sub-storms

    Ionosphere Thermosphere Mesosphere: High latitude; Mid latitude; Low latitude; Local microphysics; ITM-atmosphere; Ozone depletion.

    Contributed papers are welcome on any of the topics above. Papers on Theory-Modeling, Data analysis, and Instrumentation related to the above topics are welcome. Abstract deadline: December 15, 2005, full paper due: February 5, 2006. Details on the workshop venue, hotel accommodation, registration (online), request for financial assistance, and abstract submission can be found at the following site:

    Nat Gopalswamy and Archana Bhattacharya (SOC Co-chairs)

    SOC: P. Venkatakrishnan (India), R. Sridharan (India), Arnab Rai Chaudhuri (India), S. M. Chitre (India), G. S. Lakhina (India), A. Bhattacharya (co-chair India), M. Guhathakurta (USA), N. Gopalswamy (co-chair USA), D. Sibeck(USA), R. Robinson (USA), K. Groves (USA), W. Liu (Canada), L. Zelenyi (Russia), K. Yumoto (Japan), H. Opgenoorth (ESA), M. Zhang (China), J. N. Goswami (India), O. C. St. Cyr (USA), C. Z. Frank Cheng (Taiwan)

    Oct 11, 2005
  • Improvements to the SOHO LASCO CME CATALOG

    The SOHO/LASCO CME catalog contains a list of all CMEs manually identified since 1996 from the Large Angle and Spectrometric Coronagraph (LASCO) on board the Solar and Heliospheric Observatory (SOHO) mission. This catalog has been updated recently, with the following additional features:

    1) New parameters such as mass and kinetic energy are included in the catalog

    2) LASCO data gaps exceeding 3 hours are now listed.

    3) The catalog is now searchable from the VSO site and from the Solarsoft site.

    4) The search results include an "Event Summary" of the CMEs (image of first appearance, GOES soft X-ray plot, CME-height-time plot, and a summary of the basic attributes).

    5) For IDL users: the catalog may also be searched by the SolarSoft routine; SSW users may use that function directly for application development and to access this CME catalog within an SSW session.

    A detailed description of the catalog can be found at

    The CDAW Data Center is funded by NASA LWS program.

    Dec 16, 2003
  • Recent Publications

    Comment on "Coronal mass ejections, interplanetary ejecta and geomagnetic storms?" by H. V. Cane, I. G. Richardson, and O. C. St. Cyr
    N. Gopalswamy, N., P. K. Manoharan, P. K., and S. Yashiro

    Dec 4, 2003
  • Late-breaking Session at Fall AGU 2003 on the October-November Storms

    Fast coronal mass ejections (CMEs), X-class flares, Solar energetic particles, and interplanetary shocks - were fully observed during the recent solar eruptions in October-November 2003. The CMEs arrived at Earth with shocks and produced huge geomagnetic storms. Intense aurora, substantial enhancements of the Earth's radiation belts and high fluxes of escape velocity flows from the ionosphere to the magnetosphere were observed. The multiple magnetic storm sequences revealed interesting behaviors illuminating the processes behind the injection of plasmasheet materials into the inner magnetosphere and the subsequent ring current and then ionospheric responses. Papers on all aspects of these solar eruptions, such as their solar origin, interplanetary propagation, and geospace impact will be presented during the "late breaking session".

    Conveners: Nat Gopalswamy and Robert Wimmer-Schweingruber


    Dec 3, 2003
  • Press Activity: Magnetic Reversal at Solar Poles,9865,1093848,00.html,9865,1093848,00.html

    Aug 15, 2003
  • Recent Publications

    Coronal Mass Ejection Activity During Solar Cycle 23
    N. Gopalswamy, A. Lara, S. Yashiro, S. Nunes, and R. A. Howard

    Coronal and Interplanetary Environment of Large Solar Energetic Particle Events
    Nat Gopalswamy, Seiji Yashiro, Guillermo Stenborg, and Russell Howard

    Jun 16, 2003
  • Recent Publications

    Solar and geospace connections of energetic particle events
    N. Gopalswamy

    Large solar energetic particle events of cycle 23: A global view
    N. Gopalswamy, S. Yashiro, A. Lara, M. L. Kaiser, B. J. Thompson, P. T. Gallagher, and R. A. Howard

    A Statistical Study of CMEs Associated with Metric Type II bursts
    A. Lara, N. Gopalswamy, S. Nunes, G. Munoz, and S. Yashiro

    Long-duration hectometric type III radio bursts and their association with solar energetic particle (SEP) events
    R. J. MacDowall, A. Lara, P. K. Manoharan, N. V. Nitta, A. M. Rosas, J. L. Bougeret

    On Coronal Streamer Changes
    N. Gopalswamy, M. Shimojo, W. Lu, S. Yashiro, K. Shibasaki, and R. A. Howard

    Properties of Narrow Coronal Mass Ejections Observed with LASCO
    S. Yashiro, N. Gopalswamy, G. Michalek, and R. A. Howard

    Feb 21, 2003

  • SHINE workshops are the premier venue for lively scientific exchange between solar and heliospheric physicists. SHINE workshops are sponsored by NSF, but participation is community-wide. This year the workshop will be held on the beautiful Hawaiian island of Maui at the Outrigger Wailea ( The main workshop will be held on July 7-11. The first-ever SHINE student day workshop will be held on Sunday, July 6.

    TOPIC FOR THE WORKSHOP INCLUDE: Vector Magnetic Fields and Surface Flows: What do they tell us about CME Initiation? CME/Flare Initiation and Energetic Particles Where do Shock Waves form in the Corona? How Should we Interpret Suprathermal Particle Signatures? Coronal and Heliospheric Magnetic Field Models The First Ever SHINE Coordinated Campaign Event Studies

    Working group leaders are David Alexander (Lockheed), Nick Arge (U. of Col./CIRES & NOAA/SEC), Christina Cohen (Caltech), Todd Hoeksema (NASA HQ), Tom Holzer (HAO) and Mark Popecki (U of NH).

    TO REGISTER, GO TO THE SHINE WEB PAGE ( Click on "Meetings" then click on "Registration for the SHINE 2003 Workshop." For hotel reservations, contact the hotel (now also called the Wailea Marriott) directly at their toll free number 1-800-292-4532 (or at 808-874-8176) or by email. Mention that you belong to the SHINE group to get the discounted rate of $150/night.

    STUDENT PARTICIPATION IS ENCOURAGED! FINANCIAL AID IS AVAILABLE. If you are a student and need financial aid to attend the workshop, send email to Nat Gopalswamy indicating the level of support needed (airfare, hotel, meals, registration fee). Request for partial support will be honored first. A recommendation letter from the research supervisor is required.

    SHINE Steering Committee: Jon Linker (SAIC), Chair; Nat Gopalswamy, (NASA/GSFC), Workshop Co/rdinator; Joan Burkepile (HAO), Jim Klimchuk (NRL), Sara Martin (Helio Res.), Pete Riley (SAIC), Allan Tylka (NRL), Dave Webb (BC), and Thomas Zurbuchen (U. of Mich.). SHINE Student Leaders: David Foster (HAO), Susan Lepri (U. of Mich.)

    Feb 21, 2003
  • Recent Publications

    Effect of CME Interactions on the Production of Solar Energetic Particles
    N. Gopalswamy, S. Yashiro, G. Michalek, M. L. Kaiser, R. A. Howard, R. Leske, T. von Rosenvinge, and D. V. Reames

    Large solar energetic particle events of cycle 23: A global view
    N. Gopalswamy, S. Yashiro, A. Lara, M. L. Kaiser, B. J. Thompson, P. T. Gallagher, and R. A. Howard

    A Statistical Study of CMEs Associated with Metric Type II bursts
    A. Lara, N. Gopalswamy, S. Nunes, G. Munoz, and S. Yashiro

    Prominence Eruptions and Coronal Mass Ejection: A Statistical Study using Microwave Observations
    N. Gopalswamy, M. Shimojo, W. Lu, S. Yashiro, K. Shibasaki, and R. A. Howard

    A New Method for Estimating Widths, Velocities, and Source Location of Halo CMEs
    G. Michalek, N. Gopalswamy, and S. Yashiro

    May 9, 2002
  • Recent Publications

    Interacting Coronal Mass Ejections and Solar Energetic Particles
    N. Gopalswamy, S. Yashiro, G. Michalek, M. L. Kaiser, R. A. Howard, D. V. Reames, R. Leske, and T. von Rosenvinge

    Coronal Mass Ejections: Initiation and Detection
    N. Gopalswamy

    Relation between CMEs and ICMEs
    N. Gopalswamy

    Statistical Properties of Radio-rich Coronal Mass Ejections
    N. Gopalswamy, S. Yashiro, G. Michalek, M. L. Kaiser and R. A. Howard

    Coronal Mass Ejections and Their Geospace Consequences
    N. Gopalswamy

    November 7, 2001
  • JGR special section on Solar Eruptive Events Published

    Journal of Geophysical Research - Space Physics - has just published the special section on solar eruptive events (Vol. 106, No. A11, November 1, 2001). The issue also contains several related papers.

    The whole issue can be purchased directly from AGU for $20.

    October 4, 2001
  • Recent Publications

    Interplanetary radio emission due to interaction between two coronal mass ejections
    Nat Gopalswamy, Seiji Yashiro, Michael L. Kaiser, Russell A. Howard, and J.-L. Bougeret

    N. Gopalswamy

    August 31, 2001
  • Recent Publications

    Introduction to special section: Global picture of solar eruptive events
    N. Gopalswamy

    Near-Sun and near-Earth manifestations of solar eruptions
    N. Gopalswamy, A. Lara, M. L. Kaiser, and J.-L. Bougeret

    X-ray Ejecta, White Light CMEs and a Coronal Shock Wave
    N. Gopalswamy, O. C. St. Cyr, M. L. Kaiser, and S. Yashiro

    Characteristics of coronal mass ejections associated with long wavelength type II radio bursts
    N. Gopalswamy, S. Yashiro, M. L. Kaiser, R. A. Howard, and J.-L. Bougeret

    Predicting the 1-AU Arrival Times of Coronal Mass Ejections
    N. Gopalswamy, A. Lara, S. Yashiro, M. L. Kaiser, and R. A. Howard

    N. Gopalswamy and M. L. Kaiser

    August 29, 2001
  • SOHO/LASCO CME Catalog

    The Center for Solar Physics and Space Weather (CSPSW) announces the availability of an online catalog of CME measurements. The catalog is developed using the SOHO data in cooperation with the Naval Research Laboratory and the Solar Data Analysis Center (SDAC) at the Goddard Space Flight Center. The entries start From January 1996 (immediately after the launch of SOHO). The catalog is complete up to December 2000 and will be current soon. There are about 3000 CMEs in the catalog.

    The catalog contains a list of all CMEs identified by LASCO operators, and a few additional ones identified during our measurements. In addition, it contains a number of measurements that characterize the CMEs: Date and time of first appearance in the C2 coronagraph field of view, central position angle, angular width (twice the cone-angle), speed from linear fit to the height-time measurements, speed at the last height of measurement using quadratic fit, speed at 20 Ro using quadratic fit, acceleration obtained from the quadratic fit, and the actual position angle at which the height-time measurements are made. Links are also provided to the daily mpeg movies created by the Naval Research Laboratory using C2 and C3 coronagraph images and the Extreme-ultraviolet Imaging Telescope (EIT) images at 195 A. Each CME is identified by the date and time of occurrence. Here are some additional features of the catalog:

    1. By clicking on the date, one can view javascript movies of the CMEs within the C2 field of view, with the EIT 195 images superposed so that the solar source of the CME could be identified.
    2. By clicking on the time, one can view the actual height-time measurements.
    3. By clicking on the linear speed, one can view the height-time plot (in gif format); by clicking on the second order speed, one can view the quadratic fit.

    The catalog resides at the CSPSW's CDAW Data Center (, supported by NASA. The catalog will undergo frequent updates, so please check the web site frequently. Java-script movies may not be available for all dates at the moment.

    We started this project initially to study the relation between interplanetary type II radio bursts observed by the Wind/WAVES and then extended to all CMEs. We hope this catalog will be useful to the scientific community in enhancing scientific return from US Space missions.

    Sample measurements were made by two post-doctoral fellows, Drs S. Yashiro and G. Michalek to check for consistency. The measurements were within 10% error. We also consulted several CME researchers in developing this catalog: Drs. R. Howard (NRL), O. C. St. Cyr (CSPSW/NRL/GSFC), S. P. Plunkett (NRL), N. Rich (NRL) and G Lawrence (CSPSW).

    We encourage everyone to use the catalog and send us comments and suggestions so we can improve and refine the catalog. We would be delighted to participate in collaborative projects that use the catalog. Please keep us informed about your projects that use the catalog so we can avoid conflicts.

    We suggest that users of the catalog acknowledge the catalog to the effect of the following:

    "This CME catalog is generated and maintained by the Center for Solar Physics and Space Weather, The Catholic University of America in cooperation with the Naval Research Laboratory and NASA. SOHO is a project of international cooperation between ESA and NASA."


    N. Gopalswamy
    S. Yashiro
    G. Michalek

    April 27, 2001
  • JGR Special Section on Global picture of Solar Eruptive Events

  • A special section in JGR space Physics is getting ready to be published sometime this summer. About 20 papers on solar eruptive events based on the international conference and the 1999 ISTP/IACG workshop will appear in the special section. One can purchase a single issue of JGR-Space Physics containing the special section for $20 (non members of AGU: $40). To get an idea of the contents of the special section, Please see the introduction to the special section. You may contact the AGU directly to purchase the issue.

    April 2, 2001
  • Press Activity: CME CANNIBALISM

  • NASA
    Science News
    Scientific American Explore
    Paper in Astrophysical Journal (pdf)
    Abstract of a Related Paper (ADS)

    March 22 2000
  • Meetings area added to the CDAW web-site.

    March 6-9 2000

  • International Conference on Global Picture of Solar Eruptive Events,
    Center for Solar Physics and Space Weather, The Catholic University of America, Washington DC 20064, USA.
    Contact: Nat Gopalswamy

    February 29 2000

  • Award Announcement: The Solar Eruptive Events CDAW Organization Team was awarded
    a GSFC National Resource Award "for their tireless dedication in the development
    and innovative implementation of the Solar Eruptive Events Coordinated Data Analysis Workshop."

    January 25 2000

  • Full data access of the CDAW data-sets via HTTP and anonymous ftp services.

    December 29 1999

  • CDAW Web available to the public.

    December 10-15 1999

  • CDAW Servers available at GSFC.

    Last Modification: December 31, 1999