Ionospheric Science, Models and Databases at Haystack Observatory

download Ionospheric Science, Models and Databases at Haystack Observatory

of 13

  • date post

    07-Jan-2016
  • Category

    Documents

  • view

    29
  • download

    0

Embed Size (px)

description

Ionospheric Science, Models and Databases at Haystack Observatory. Haystack Observatory/Lincoln Laboratory Collaboration Workshop March 9, 2007. Madrigal Database/Virtual Observatory. Distributed, open-source, standards-based local databases that share metadata and have VO-features built in. - PowerPoint PPT Presentation

Transcript of Ionospheric Science, Models and Databases at Haystack Observatory

  • Ionospheric Science, Models and Databases atHaystack ObservatoryHaystack Observatory/Lincoln Laboratory Collaboration WorkshopMarch 9, 2007

  • Madrigal Database/Virtual ObservatoryDistributed, open-source, standards-based local databases that share metadata and have VO-features built in AMISR

  • The Madrigal database stores data from a wide variety of upper atmosphere research instruments in the Cedar database format.Incoherent Scatter RadarTEC via GPSMF RadarCedar database formatLoading programs can bewritten in Python, C, or TclOther instrument types in Madrigal: Meteor radar, Digisonde, Fabry-Perot, Geophysical indices

  • What is the local Madrigal database?UserWebinterfaceWeb services APIPython APIMatlab APIAllows for easy VO accessFrom anywhere on internetDatabase standard Cedar file formatMetadata standard Madrigal standardReal-time and historical data

  • How is Madrigal a Virtual Observatory?Searches from local Madrigal site can link to any other siteUser chooses whetherthe search is local orincludes all MadrigalsitesImplemented via shared,standard metadata

  • eGY, IPY, IHYAll inspired by the success of the 1957 International Geophysical Year 50 years agoeGY The electronic Geophysical YearIPY The International Polar YearStarts March 2007IHY The International Heliophysical Year (2007)For space physics, all three overlap

  • AreciboMillstoneSondrestromAmerica SectorLower MidlatitudesShigarakiSt SantinSubauroralMidlatitudeTromsoHighlatitudeSvalbardEast AsiaEuropean SectorElectron density annual variations derived from long-term datasets for worldwide ISRsMillstone / Sondrestrom Convection Model

  • St Santin, June, 350-400 km

  • Storm-Time Penetration Electric Fields

  • Ring Current / SAPS/ SED Plume(Sub Auroral Polarization Stream Electric Field)Duskside Region-2 FACs close poleward across low-conductance gapSAPS: Strong poleward Electric Fields are set up across the sub-auroral ionosphereSAPS erodes the cold plasma of the ionosphere and the outer plasmasphereAURORAL OVALLOW S SAPS E FIELD

  • Magnetosphere-Ionosphere Coupling at thePlasmasphere Boundary Layer

  • September 2005 wind featuresSep 2005Fall climatologyWind magnitude in September 2005 is higher than average wind during fall equinox for both zonal and meridional components

  • MIT Haystack Observatory Atmospheric Sciences GroupHaystack Observatory's Atmospheric Sciences Group studies all levels of the atmosphere using incoherent scatter radar (ISR) and distributed arrays of radiowave instruments such as Global Positioning System (GPS) receivers. The group has been operating for more than forty years, collecting ionospheric measurements spanning a range of latitudes covering most of Eastern North America. Most of these measurements are available from the Madrigal Database. Recent GPS measurements have extended this to global coverage.The unique location of Millstone Hill near the Earth's plasmapause, combined with the wide reach of the Millstone Hill steerable antenna, have made it a premier facility for mid-latitude ionospheric research, magnetospheric studies and thermospheric measurements. In addition to improving our fundamental understanding of the near-Earth environment, this research has immediate relevance to the welfare of people and our technological society since it contributes to the development of improved space weather alerts and storm predictions.

    In the lower thermosphere at mid-latitudes, the dominating feature of a wind flow is a strong tidal signature of 12-hour wave. It has downward phase propagation (i.e. upward energy propagation) indicating that tides are originated at lower altitudes and propagate upwards. Tidal features vary considerably with altitude, season and from day to day, and sources driving this variability are not well understood.One of the unexpected findings during Sep 2005 ISR World month was a large magnitude of wind for both zonal and meridional components. The left part of the figure shows zonal (top) and meridional (bottom) components of neutral wind is September 2005, while right part of the figure shows average wind during fall equinox obtained from many years of data. In September 2005, the semidiurnal pattern is dominant, as expected for mid-latitude location, and phases are similar to average phases, but magnitude of the wind is much larger, indicating a very strong semidiurnal tide. The wind magnitude in Sep 2005 is stronger than average summertime wind (and summer is traditionally the season with largest winds). Preliminary comparisons with TIMED TIDI data show that TIDI fall 2005 winds are higher than during other years. It might indicate large interannual variability in mesospheric and lower thermospheric dynamics. The sources and mechanisms driving interannual variability at mid-latitudes are not understood, and we are looking for more experimental and theoretical evidence.