Home Radar - meteor, MF Radar - Incoherent Scatter Lidar Observations Optical - imagers, spectrometers, interferometers Satellite - dynamics, wind/temperature Satellite - constituents, stratosphere, mesosphere Satellite - troposphere (water vapour, convection...) Magnetometers - Ionosphere, current systems GPS - temperature, water Models - GCM's, linear models, mechanistic models Ionosondes Microwaves Request for Access Data Archives View Data Archives List of Available Data	The CAWSES Global Tidal Campaign effort has been organized to advance our understanding of atmospheric tides and to facilitate interactions between the experimentalists; modellers and theoreticians (see the summary document for a detailed rationale and description of this effort, and the organizing committee for a list of those involved in setting up the project). It is a project sponsored by the Climate and Weather of the Sun Earth System (http://www.bu.edu/cawses/). CAWSES is an international program sponsored by SCOSTEP (Scientific Committee on Solar-Terrestrial Physics). Tides are global scale waves which are thought to be forced in the troposphere and stratosphere and grow in amplitude with height. They dominate the wind, temperature and constituent variability in the mesosphere and lower thermosphere. Although the migrating diurnal tide is the strongest component in the tidal field, a significant number of other components (with a variety of wavenumbers and harmonics of a day¯¹) are important. Their strength varies on time scales of ranging from days to years. What is observed is the superposition of these components. Because the observed tidal field is a superposition of components whose amplitudes vary in time, tidal amplitudes will vary geographically and temporally. A global observing system is required to resolve the various components contributing to this field. Some outstanding scientific questions on tides which remain include: The identity of the tidal components contributing to the observed tidal field, their temporal variability and their interactions. The source of the various components (separate direct solar effects from latent heat release, convection and non-linear interactions) The impact of these components: On constituent distribution and mixing On the momentum balance in the mesosphere and lower thermosphere On the energetics of the mesosphere and lower thermosphere On the electrodynamics of the lower thermosphere The interaction of these components with planetary waves and gravity waves The CAWSES Global Tidal Campaign is intended to support and coordinate the global measurements needed to resolve these questions. There are four active tidal campaigns being studied for comparison: September 1 -October 31, 2005, March 1 - April 30, 2007 June 1 - August 15, 2007 December 1, 2007 - February 15, 2008 Observations taken during these periods are of particular interest to this effort. Model output and observations from radar, ionosondes, lidar, optical photometers, spectrometers and interferometers, magnetometers and satellites are all welcome (in fact any parameter from which information on atmospheric tides can be determined). The following scientists have agreed to coordinate inputs for various types of observations. Radar - meteor, MF, (Werner Singer, singer@iap-kborn.de ) Radar - Incoherent Scatter (Larisa Goncharenko, lpg@haystack.mit.edu) Lidar - (Michael Gerding, gerding@iap-kborn.de, Phillippe Keckhut, Philippe.Keckhut@aerov.jussieu.fr) Optical - imagers, spectrometers, interferometers (Juergen Scheer, jurgen@caerce.edu.ar, jurgen@iafe.uba.ar) Satellite - dynamics, wind/temperature (Jens Oberheide, joberh@uni-wuppertal.de) Satellite - constituents, stratosphere, mesosphere, lower thermosphere (Dan Marsh, marsh@ucar.edu) Satellite - troposphere (water vapour, convection ...) (contact TBD) Magnetometers - Ionosphere, current systems (Gurubaran, gurubara@iigs.iigm.res.in ) GPS - temperature, water (COSMIC/CHAMP contact TBD) Models - GCM's, linear models, mechanistic models, (William Ward, wward@unb.ca) Other techniques (contact TBD) To participate in this initiative contact William Ward (wward@unb.ca) or any of the coordinators listed above. Analysis of the data and comparison with models takes place during annual workshops. The next workshop is in Fredericton, NB, Canada, August 19-22, 2008. Group leaders will start a day earlier on August 18.	Current Events CAWSES Global Tides Workshop 3 will be held on August 19-22, 2008. in Fredericton, NB See what is planned for future activity