BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Modulation of the galactic proton energy spectrum in the inner hel iosphere DTSTART;VALUE=DATE-TIME:20070710T153000Z DTEND;VALUE=DATE-TIME:20070710T154200Z DTSTAMP;VALUE=DATE-TIME:20261012T215115Z UID:indico-contribution-88-0-960@cern.ch DESCRIPTION:Speakers: Dr. KECSKEMETY\, Karoly (KFKI RMKI)\nThe energy spec tra of protons in the 1-100 MeV range are studied under quiet \nsolar acti vity periods during the 21st - 23rd cycles using data sets from near-\nEar th spacecraft. A series of low-flux spectra is approximated by the form J( E)\n=AE(^-g)+CE^n\, the two terms describing solar/heliospheric and galact ic \ncomponents\, respectively. By determining the best fitting parameters to the \nenergy spectra\, we obtain that n has a mean value of 1.3 +- 0.1 5\, significantly \nsteeper than the linear spectrum predicted by the forc e-field approximation. In \nmodulation theories n > 1 corresponds to a neg ative Compton-Getting factor \nposing a challenge. Such inversion may occu r if the radial diffusion coefficient \nkappa(rr) < rV (r is radial distan ce and V solar wind speed)\, then\, most of the \nlower energy particles r eaching 1 AU have been cooled down within 1 AU and \nare subsequently conv ected outward by the solar wind. The probability \ndistributions of n valu es exhibit two-peak structure and depend on the \nheliomagnetic cycle phas e\, being different for odd and even cycles. Correlations \nmade with sola r activity indicate that the spectral slope slightly decreases with \nincr easing solar activity whereas n seems to reflect drift processes in the \n heliosphere. Possible interpretations are discussed.\n\nhttps://indico.nuc leares.unam.mx/event/4/session/88/contribution/960 LOCATION:Merida\, Mexico Yucatan I (Fiesta Americana) URL:https://indico.nucleares.unam.mx/event/4/session/88/contribution/960 END:VEVENT BEGIN:VEVENT SUMMARY:Virtual Cosmic Ray Observatory (ViCRO) DTSTART;VALUE=DATE-TIME:20070710T154200Z DTEND;VALUE=DATE-TIME:20070710T155400Z DTSTAMP;VALUE=DATE-TIME:20261012T215115Z UID:indico-contribution-88-0-377@cern.ch DESCRIPTION:Speakers: Dr. COOPER\, John (NASA Goddard Space Flight Center) \nThe Virtual Cosmic Ray Observatory (ViCRO) is proposed to extend planned capabilities\nof NASA’s existing or developing heliophysics virtual obs ervatories with a collection\nof important cosmic ray datasets with an ini tial focus on interplanetary solar and\nheliospheric science applications. Recent work from the Advanced Composition Explorer\n(ACE) and Voyager spa cecraft shows the science value of intercalibrated flux and\ncumulative fl uence spectra from multiple sensors with contiguous energy coverage.\nThes e data can be applied to investigation of solar flare and coronal mass eje ction\nevents\, acceleration and transport of interplanetary particles wit hin the inner\nheliosphere\, cosmic ray interactions with planetary surfac es and atmospheres\, sources\nof anomalous cosmic ray ions in the outer he liosphere\, and solar cycle modulation of\ngalactic cosmic rays. Data reso urces include operational and legacy missions with\nappropriate instrument s throughout the heliosphere and geospace that provide relevant\ndatasets for solar\, heliospheric\, and galactic cosmic ray particles. Core operati onal\ndata sources include the Heliospheric Network (HN) spacecraft. We wi ll collaborate\nwith HN data providers to ensure availability through a co mmon middleware interface\nto the distributed holdings of providers and th e availability of both documentation\nand science expertise to support the use of data by the heliophysics and other\nrelated research communities.\ n\nhttps://indico.nucleares.unam.mx/event/4/session/88/contribution/377 LOCATION:Merida\, Mexico Yucatan I (Fiesta Americana) URL:https://indico.nucleares.unam.mx/event/4/session/88/contribution/377 END:VEVENT BEGIN:VEVENT SUMMARY:Some implications of recent Voyager 1 and 2 directional and omnidi rectional energetic particle data DTSTART;VALUE=DATE-TIME:20070710T155400Z DTEND;VALUE=DATE-TIME:20070710T160600Z DTSTAMP;VALUE=DATE-TIME:20261012T215115Z UID:indico-contribution-88-0-947@cern.ch DESCRIPTION:Speakers: KIRÁLY\, Péter (KFKI Research Institute for Partic le and Nuclear Research)\nSince the December 2004 termination shock trans it of Voyager 1\, Voyager 2 data have\nshown partly analogous\, partly dis similar features to the pre-shock activity seen by\nVoyager 1. One importa nt point is the different energy dependence of suprathermal and\nmildly en ergetic omnidirectional particle flux variations for the two data sets.\nF irst harmonic anisotropy amplitudes and phases also display some dissimila r\nfeatures. Implications of those differences will be discussed. \n\nThe present gradual approach towards solar minimum on the one hand and some\nS un-related solar wind shocks on the other also cause variations that are c ommon to\ndownstream V1 and time delayed upstream V2 fluxes\, particularly in the high energy\nregion attributed mostly to cosmic rays. A comparison with solar wind data for\nVoyager-2 and magnetic field data for Voyager-1 will also be done.\n\nhttps://indico.nucleares.unam.mx/event/4/session/88 /contribution/947 LOCATION:Merida\, Mexico Yucatan I (Fiesta Americana) URL:https://indico.nucleares.unam.mx/event/4/session/88/contribution/947 END:VEVENT BEGIN:VEVENT SUMMARY:Possible Role of Transients on the Energy Spectum of Energetic Par ticles at Solar wind Termination Shock DTSTART;VALUE=DATE-TIME:20070710T160600Z DTEND;VALUE=DATE-TIME:20070710T161800Z DTSTAMP;VALUE=DATE-TIME:20261012T215115Z UID:indico-contribution-88-0-1118@cern.ch DESCRIPTION:Speakers: CUMMINGS\, A. C. (California Institute of Technology )\nWe examine the Voyager 1 (V1) and Voyager 2 (V2) intensity vs. time \np rofiles in several energy bands of low-energy particle populations \ndurin g the period 2005 through early 2007. There appear to be a set \nof propag ating structures with ~1 year duration that appear first at \nV2\, which i s upwind of the solar wind termination shock\, and then ~115 \ndays later at V1 in the heliosheath. We will discuss these observations \nin the cont ext of the source and transport of the termination shock \nparticles and a nomalous cosmic rays. \n\nThis work was supported by NASA under contract N AS7-03001.\n\nhttps://indico.nucleares.unam.mx/event/4/session/88/contribu tion/1118 LOCATION:Merida\, Mexico Yucatan I (Fiesta Americana) URL:https://indico.nucleares.unam.mx/event/4/session/88/contribution/1118 END:VEVENT BEGIN:VEVENT SUMMARY:Voyager 1 and 2 Observations of Energetic Particles near the Solar Wind Termination Shock DTSTART;VALUE=DATE-TIME:20070710T161800Z DTEND;VALUE=DATE-TIME:20070710T163000Z DTSTAMP;VALUE=DATE-TIME:20261012T215115Z UID:indico-contribution-88-0-1161@cern.ch DESCRIPTION:Speakers: STONE\, E. C. (California Institute of Technology)\n Voyager 1 (V1) continues to explore the heliosheath after crossing the sol ar \nwind termination shock on 16 December 2004. Voyager 2 (V2) is observi ng \ntermination shock particles (TSPs) and may cross the shock at any tim e.\nThe source of the classic anomalous cosmic rays (ACRs) is still\nunder debate as it was not located at the shock where V1 crossed \n(~34 N helio latitude). The ACR spectrum at V2 is very similar \nto that observed at V1 just as it crossed the shock\, suggesting\nthat the source spectrum of AC Rs will not be observed at the \nV2 crossing site (~27 S) either. We will report on the latest\nobservations from these two spacecraft in an ongoing effort\nto solve one of the major puzzles of V1's termination shock cross ing.\n\nThis work was supported by NASA under contract NAS7-03001.\n\nhttp s://indico.nucleares.unam.mx/event/4/session/88/contribution/1161 LOCATION:Merida\, Mexico Yucatan I (Fiesta Americana) URL:https://indico.nucleares.unam.mx/event/4/session/88/contribution/1161 END:VEVENT BEGIN:VEVENT SUMMARY:Energetic neutral atom observations and their implications on mode ling the heliosheath DTSTART;VALUE=DATE-TIME:20070710T163000Z DTEND;VALUE=DATE-TIME:20070710T164200Z DTSTAMP;VALUE=DATE-TIME:20261012T215115Z UID:indico-contribution-88-0-90@cern.ch DESCRIPTION:Speakers: HILCHENBACH\, Martin (Max-Planck-Institut for Solar System Research)\nSince 1996\, energetic hydrogen and helium atoms (ENAs) have been identified and their \nfluxes are monitored by the High-Energy S uprathermal Time-of-Flight sensor (HSTOF) of\nthe Charge\, Element\, and I sotope Analysis System (CELIAS) on the Solar and\nHeliospheric Observatory (SOHO) near the Lagrangian point L1. ENAs\, neutralized via\ncharge trans fer reactions\, move along ballistic trajectories unaffected by the\ninter planetary magnetic field. ENAs originate in the heliosphere from CIRs\, so lar\nenergetic particle events\, pre-accelerated pickup ions and low-energ y (up to few\nhundred keV) anomalous cosmic ray (ACR) ions in the outer he liosphere\, in the\nvicinity and beyond the solar wind termination shock. The observed ENA fluxes set\nupper limits on the fluxes of energetic part icles in the outer heliosphere and on the\nmodelling parameters of the hel iospheric plasma simulations.\n\nhttps://indico.nucleares.unam.mx/event/4/ session/88/contribution/90 LOCATION:Merida\, Mexico Yucatan I (Fiesta Americana) URL:https://indico.nucleares.unam.mx/event/4/session/88/contribution/90 END:VEVENT BEGIN:VEVENT SUMMARY:Time-of-Flight Detector System of the IBEX-lo Sensor with Low Back ground Performance for Heliospheric ENA Detection DTSTART;VALUE=DATE-TIME:20070710T164200Z DTEND;VALUE=DATE-TIME:20070710T165400Z DTSTAMP;VALUE=DATE-TIME:20261012T215115Z UID:indico-contribution-88-0-768@cern.ch DESCRIPTION:Speakers: Prof. MOEBIUS\, Eberhard (University of New Hampshir e)\nIBEX-lo on the Interstellar Boundary Explorer (IBEX) will image energe tic neutral H atoms (ENA) from the \ntermination shock at 10 – 2000 eV a nd the flow distribution of interstellar O in spring and fall. The sensor \ncombines a mechanical collimator to restrict the detectable arrival dire ctions\, an atom to negative ion conversion \nsurface\, an electrostatic a nalyzer\, post-acceleration up to 20 keV\, and time-of-flight (TOF) analys is\, providing \nspecies separation and effective background suppression. Because the flux of the heliospheric ENAs is very low a \ntriple coinciden ce system is used with secondary electrons produced at two consecutive car bon foils\, followed by \ndetection of the ions in a micro-channelplate. T hese signals are combined into three independent TOF \nmeasurements. Meanw hile the flight model of the TOF subsystem has been fabricated\, tested an d calibrated. It \nwill be shown how the combination of several TOF measur ements is very effective to suppress background to \nunprecedented levels and to identify minor species\, whose fluxes are several orders of magnitu de below the main \nspecies. Results from the testing of both the engineer ing and the flight unit will be discussed in the light of the \nIBEX scien ce objectives to study the termination shock and the heliosheath.\n\nhttps ://indico.nucleares.unam.mx/event/4/session/88/contribution/768 LOCATION:Merida\, Mexico Yucatan I (Fiesta Americana) URL:https://indico.nucleares.unam.mx/event/4/session/88/contribution/768 END:VEVENT END:VCALENDAR