September 99 International Space Weather Campaign -- Call for Participation -- sign up form   Purpose: To study a space weather event from its initiation at the sun to its impacts at the Earth including effects on space-based and ground-based worldwide assets and assessment of the accuracy of forecasting techniques. Special features of this campaign are: Broad international cooperation  As complete as possible space-based and ground-based observations of the event.  Encouraging involvement of the user communities both in the planning and execution of the campaign.  Encouraging participation of the forecasting community   Who: The worldwide space science community  Users whose systems are impacted by space weather conditions  Space weather forecasters  Role of SCOSTEP/ S-RAMP: Coordination of the campaign will be undertaken by SCOSTEP/SRAMP. Prior to the campaign, lists of participants and contact information will be compiled to facilitate collaborations.  Will act as a collection site or clearinghouse for information from the campaign interval, housing datasets and/or linking to data bases from the campaign interval.  When: We are in the process of negotiating three floating incoherent scatter radar world days during the month of September 1999. 1999 International Geophysical Calendar. Watch this site for further details.  Campaign days will be selected on the basis of geoeffective solar activity.  The month of the campaign was switched recently from October 1999 to September 1999. This was done to maximize overlap with the POLAR spacecraft observations which provide a crucial global perspective for the campaign. During October 1999, POLAR performs a flip maneuver resulting in the loss of observations for from ~2-4 weeks depending on the instrument involved. A switch of the campaign to November 1999 was not possible due to the involvement of the Incoherent Scatter Radars in observing the Leonids meteor shower.   To Participate: Send comments or sign up to participate in the campaign (sign-up form) so that an up-to-date list of participants can be constructed and plans for collaborations can begin among the participants.  Give some indication of the type of measurement or modeling in which you are involved.  Indicate whether your observations will be confined to the 3-day campaign interval or if they will extend over some longer period during September 1999  Provide contact information (address, email, phone, fax).