From - Mon Apr 28 13:53:26 2003 X-Mozilla-Status: 0001 X-Mozilla-Status2: 00000000 Received: from star.its.uiowa.edu (star.its.uiowa.edu [128.255.56.129]) by kochab.physics.uiowa.edu (8.11.6+Sun/8.11.6) with ESMTP id h3S56gG26201 for ; Mon, 28 Apr 2003 00:06:42 -0500 (CDT) Received: from pimout3-ext.prodigy.net (pimout3-ext.prodigy.net [207.115.63.102]) by star.its.uiowa.edu (8.12.9/8.12.9/uiowa-2.9) with ESMTP id h3S56fK1055464 for ; Mon, 28 Apr 2003 00:06:42 -0500 Received: from [66.125.84.99] (adsl-66-125-84-97.dsl.sntc01.pacbell.net [66.125.84.97]) by pimout3-ext.prodigy.net (8.12.9/8.12.3) with ESMTP id h3S56dUl098830 for ; Mon, 28 Apr 2003 01:06:40 -0400 Mime-Version: 1.0 Message-Id: Date: Sun, 27 Apr 2003 22:06:18 -0700 To: Jolene Pickett From: Umran Inan Subject: STAMMS abstracts --- Content-Type: text/plain; charset="us-ascii" ; format="flowed" Content-Length: 6610 Dear Jolene -- Here are my two abstracts. I am assuming you will be able to work with Pierette to have these submitted. If at all possible, I would like to have them both be talks, as I truly hate giving poster presentations. If they cannot both be talks, I will pull the second one out. If you can schedule both of them, I would like to have them separated (in-time) from one another). The second one could indeed be a short talk, and I believe Manuel would be interested in putting this into the STAMMS meeting proceedings as you suggested. I have made arrangements (but not yet bought tickets) to arrive at Orleans (by train from Paris) mid-morning on the 12th, and return home on the 14th. This gives me two days at the meeting, and I am afraid it is the best I can do, given my extremely busy schedule at this point. I will finalize plans after I hear from you. By the way, which hotel should one stay in? I will look forward to the meeting, depending on whether you can fit the abstracts. I am sorry for the delays, but I finally worked out what I will do to cover my course and decided to attend after seeing that you and Pierette are disappointed. I also realize that this might be a meeting that is not well attended, and I wanted to do my part to contribute to its success, as I believe CLUSTER is an excellent and unique mission. Thanks and best regards. --Umran Abstracts for STAMMS meeting: MULTI-POINT MEASUREMENTS OF THE SOURCE STRUCTURE AND MOTION OF DISCRETE ELECTROMAGNETIC WAVES Umran S. Inan Space, Telecommunications and Radioscience (STAR) Laboratory, Stanford University, Stanford, CA 94305, USA The wideband instrument (WBD) on the CLUSTER spacecraft provides an unprecedented opportunity to measure the spatial extent and motion of what are believed to be highly compact source(s) of discrete electromagnetic whistler-mode emissions such as whistler-mode chorus. Chorus emissions are believed to be responsible for the acceleration of electrons to MeV energies in the outer radiation belts, as well as being responsible for the scattering loss of electrons in the energy range of tens to hundreds of keV. In view of the emerging importance of high energy radiation in the context of pace Weather and resultant effects on space-based instrumentation and systems, understanding the mechanisms and effects of interactions of energetic particles with discrete chorus waves have recently come to for as a matter of a renewed and imminent importance. CLUSTER observations of chorus near the perigee of its orbit have led to surprising new features, such as frequency shifts of up to a kHz between emissions observed on different (but nearby) satellites, allowing the first-ever determination of the rapid motions of the source(s) of these discrete and intense electromagnetic emissions. In view of the compact nature of the source(s), such frequency shifts are expected to be highly dependent on the separation distance of the spacecraft. In this talk, we summarize the highlights of CLUSTER observations of chorus, and quantify the dependence of the frequency shift on the separation distance of the observing spacecraft, in the context of highly compact but rapidly sources which produce these emissions. CLUSTER OBSERVATIONS OF ELF/VLF SIGNALS GENERATED BY MODULATED HEATING OF THE LOWER IONOSPHERE WITH THE HAARP HF TRANSMITTER M. Platino, U. S. Inan, T. F. Bell, J. Pickett Space, Telecommunications and Radioscience (STAR) Laboratory, Stanford University, Stanford, CA 94305, USA Modulated HF transmissions has been a well established method for generation of ELF/VLF signals using the so-called "electrojet antenna". Although most observations of the generated ELF/VLF signals have been realized on the ground, several low- and high-altitude satellite observations have also been reported [e.g., James et al., JGR, p. 12187, 1990]. One of the important unknowns in the physics of ELF/VLF wave generation by ionospheric heating is the spatial extent of the radiating source regions. Multiple spacecraft observations with the CLUSTER/WBD instrument provide an excellent opportunity to determine the extent of the magnetospheric regions illuminated from the lower ionospheric regions heated by the HF transmitter, from which one can (via ray tracing) estimate the spatial extent and distribution of the ELF/VLF source regions. For this purpose, ground-satellite conjunction experiments have been conducted during the past few months between CLUSTER and the HF High-Frequency Active Auroral Program (HAARP) facility in Gakona, Alaska. The HAARP facility is a highly agile and modern instrument, which is currently being upgraded to triple its radiated power and antenna array size by 2005. Once completed, this facility will be the most powerful HF heater in the world, capable of producing ELF/VLF waves at intensities ten times higher than ever before. Being located on largely closed field lines at L=4.9, HAARP is currently also being used for ground-to-ground type of ELF/VLF wave-injection experiments, and will be increasingly used for this purpose as it is upgraded. In this talk, we present recent results of the HAARP-CLUSTER experiments. At 12:13 PM -0500 4/23/03, Jolene Pickett wrote: >Date: Wed, 23 Apr 2003 12:13:59 -0500 >From: Jolene Pickett >X-Accept-Language: en,pdf >To: inan@nova.stanford.edu >CC: pickett@uiowa.edu >Subject: STAMMS >X-Priority: 1 (Highest) >Status: > >Dear Umran, > >Did you have Manuel submit the abstract for STAMMS? If so, >could you or he forward a copy to me. The deadline for >submission of abstracts was yesterday, but today would >probably still be ok. > >Also, Pierretee is quite disappointed that you have decided >not to attend STAMMS and present your chorus results. She >asks whether you would submit the work as a poster and have >one of your co-authors present it. She suggested me since >I am the only one going to STAMMS of your co-authors (I >think). Unfortunately, I can only stand in one place at >a time, so if you decided to make HAARP a poster and you >agreed to the chorus work as a poster, the two would have >to be co-located. If the HAARP was an oral, there would >be no problem with a chorus poster. > >I look forward to hearing from you soon. > >Best regards, > >Jolene -- Umran Inan Packard Bldg Rm. 355, 350 Serra Mall Stanford University, Stanford, CA 94305-9515 Tel: (650) 723-4994, FAX: (650)723-9251 Home Page: http://www-star.stanford.edu/~vlf/