[{"data":1,"prerenderedAt":76},["ShallowReactive",2],{"dataset-akebono-sms-data":3,"relation-diagrams-akebono-sms-data":73},{"@context":4,"@type":5,"@id":6,"name":7,"url":14,"version":15,"keywords":16,"license":24,"isAccessibleForFree":26,"distribution":27,"temporalCoverage":35,"creator":36,"copyrightHolder":50,"citation":64,"abstruct":69,"articleBody":70},"https:\u002F\u002Fschema.org\u002F","Dataset","darts:akebono-sms-data",[8,11],{"@language":9,"@value":10},"ja","あけぼの 超熱イオン質量分析計（SMS）データ",{"@language":12,"@value":13},"en","Akebono Suprathermal Ion Mass Spectrometer (SMS) data","https:\u002F\u002Fdata.darts.isas.jaxa.jp\u002Fpub\u002Fakebono\u002Fsms\u002F","N\u002FA",[17,18,19,20,21,22,23],"mission:AKEBONO","mission:EXOS-D","instrument:Suprathermal Ion Mass Spectrometer (SMS)","field:SpacePlasmaPhysics","target:Geospace","target:Aurora","observation:Ion",[25],"https:\u002F\u002Fwww.isas.jaxa.jp\u002Fen\u002Fresearchers\u002Fdata-policy\u002F",true,[28,31],{"@type":29,"encodingFormat":30,"contentUrl":14},"DataDownload","image\u002Fjpeg",{"@type":29,"encodingFormat":32,"contentUrl":34},[30,33],"application\u002Foctet-stream","https:\u002F\u002Fdarts.isas.jaxa.jp\u002Fapp\u002Fstp\u002Fakebono\u002FSMS.html","1989-03-31T11:17\u002F1994-12-27T12:44",[37],{"@type":38,"url":39,"sameAs":40,"name":41,"contactPoint":46},"Organization","https:\u002F\u002Fwww.isas.jaxa.jp\u002F","https:\u002F\u002Fror.org\u002F034gcgw60",[42,44],{"@language":12,"@value":43},"ISAS > Institute of Space and Astronautical Science",{"@language":9,"@value":45},"宇宙科学研究所",{"@type":47,"contactType":48,"email":49},"ContactPoint","DARTS help desk","darts-admin@ML.isas.jaxa.jp",[51,59],{"@type":38,"url":52,"sameAs":53,"name":54},"https:\u002F\u002Fwww.jaxa.jp\u002F","https:\u002F\u002Fror.org\u002F059yhyy33",[55,57],{"@language":12,"@value":56},"JAXA > Japan Aerospace Exploration Agency",{"@language":9,"@value":58},"宇宙航空研究開発機構",{"@type":38,"url":39,"sameAs":40,"name":60,"contactPoint":63},[61,62],{"@language":12,"@value":43},{"@language":9,"@value":45},{"@type":47,"contactType":48,"email":49},[65,66,67,68],"Oya, H. et al. (1990) Journal of Geomagnetism and Geoelectricity - Introduction to the Akebono (EXOS-D) satellite observations. https:\u002F\u002Fdoi.org\u002F10.5636\u002Fjgg.42.367","Whalen, B. A. et al, (1990) Journal of Geomagnetism and Geoelectricity - The suprathermal ion mass spectrometer (SMS) onboard the Akebono (EXOS-D) satellite https:\u002F\u002Fdoi.org\u002F10.5636\u002Fjgg.42.511","Yau, A. W. et al, (1998) Geophysical Monograph Series - Radio-Frequency Ion Mass Spectrometer Measurements of Ion Composition, Velocity and Temperature: the EXOS-D Suprathermal Mass Spectrometer https:\u002F\u002Fdoi.org\u002F10.1029\u002FGM102p0307","Readme https:\u002F\u002Fwww.stp.isas.jaxa.jp\u002Fakebono\u002Freadme\u002Freadme.sms.txt","pub\u002Fakebono\u002Fsms\u002F\n├── sample.jpg\n├── 1989\u002F, 1990\u002F, ..., {YYYY}\u002F\n|   ├── {YYYY}.idx\n|   └── 01\u002F, 02\u002F, ..., {MM}\u002F\n|        ├── {YYYY}_{MM}.idx\n|        └── {YYMMDDhhmm}.jpg\n├── 1989_0\u002F, 1989_1\u002F, ..., {YYYY}_[0|1]\u002F\n|   ├── {YYYY}.idx\n|   └── 01\u002F, 02\u002F, ..., {MM}\u002F\n|        ├── {YYYY}_{MM}.idx\n|        ├── {YYMMDDhhmm}.jpg\n|        ├── exptp.lis\n|        └── mf\n├── SMS\u002F  sample.jpg\n└── tmp\u002F  [not expanded]\n",{"@value":71,"@language":12,"encodingFormat":72},"The Akebono Suprathermal Ion Mass Spectrometer (SMS) is a radio-frequency ion mass spectrometer. It is designed to measure the mass composition and velocity distribution (mass-per-charge, energy-per-charge and angular distribution in the spacecraft spin-plane) of thermal and suprathermal (0.1-4000 eV\u002Fq) ions in the ionosphere and magnetosphere. It consists of a retarding potential analyzer, a 3-stage modified Bennett ion mass spectrometer, and a micro-channel plate detector. It can sample ions at 256 mass steps over the 1-80 AMU\u002Fq mass range, and 256 retarding potential steps in the 0.1-25.6V range, and 16 suprathermal energy steps in the 100-4000 V range. It operates in a number of fast scan and mass scan operation modes.\nFor a detailed description of the SMS instrument and its operation, please see [Whalen et al, 1990](https:\u002F\u002Fdoi.org\u002F10.5636\u002Fjgg.42.511) and [Yau et al, 1998](https:\u002F\u002Fdoi.org\u002F10.1029\u002FGM102p0307).\n\n## SMS Summary Plots\nThe Summary Plots in the SMS SDB present 64-s averaged data (32-s averaged data where an orbit pass is less than 32 minutes), in the following format:\n\n- Panel a: Spin angle versus time spectrogram of thermal H+ ion counts\n- Panel b: Spin angle versus time spectrogram of thermal He+ ion counts\n- Panel c: Spin angle versus time spectrogram of thermal O++ or He++ ion counts\n- Panel d: Spin angle versus time spectrogram of thermal O+ ion counts\n- Panel e: Retarding potential steps (histograms) and minimum ram angle\n- Panel f: Spin angle versus time spectrogram of suprathermal H+ ion counts\n- Panel g: Spin angle versus time spectrogram of suprathermal O+ ion counts\n- Panel h: Suprathermal energy steps (histograms) and minimum pitch angle\n\n**In panels a-d and g-h:**\n- The spin angle is defined with respect to the direction nearest to the local magnetic field, in degrees (-180 to 180). 0o ions are parallel to (or closest to) the magnetic field, i.e. downward in the northern and upward in the southern hemispheres. +\u002F-180o ions are anti-parallel to (or farthest from) the magnetic field; +\u002F-90o ions are perpendicular to it.\n- The curve denotes the spacecraft ram direction, i.e., the spin angle closest to the spacecraft velocity direction.\n\n**In panel d:**\n- The color of the histogram denotes the instrument entrance aperture selected for the thermal ion measurements. Red: large aperture; yellow: medium aperture; green: small aperture.\n- The retarding potential, V, is in volts (0 - 25).\n- The minimum ram angle, r, is in degrees (0 - 90).\n\n**In panel h:**\n- The suprathermal energy, E, is in volts (0 - 4000).\n- The minimum pitch angle, p, is in degrees (0 - 90).\n\n**Data Reliability Flag**\n- The horizontal line below panel h is a data quality indicator. Green: data valid; yellow: data probably reliable but caution required in data interpretation; red: data may be unreliable - consult SMS Science Team before use; white (or black): data quality unspecified.\n\n\nIf you have any questions or request for the data, please contact [DARTS](https:\u002F\u002Fdarts.isas.jaxa.jp\u002Fen\u002Fcontact).\n\n## Request for using this data\nIn any publications, the use of the Akebono data should be acknowledged, for example,\n\n> \"The AKEBONO\u002FSMS data were provided by Prof. Andrew W. Yau through DARTS at the Institute of Space and Astronautical Science (ISAS), Japan\"","markdown",{"ja":74,"en":75},"graph LR\n classDef this fill:#ffa23e\n  darts:akebono-sms-data[\"あけぼの 超熱イオン質量分析計（SMS）データ\"]:::this\nclick darts:akebono-sms-data href \"\u002Fdatasets\u002Fdarts:akebono-sms-data\"\n","graph LR\n classDef this fill:#ffa23e\n  darts:akebono-sms-data[\"Akebono Suprathermal Ion Mass Spectrometer (SMS) data\"]:::this\nclick darts:akebono-sms-data href \"\u002Fdatasets\u002Fdarts:akebono-sms-data\"\n",1780296762653]