Data Description

This page summarizes information about the selected resource and its origin based on SPASE metadata.

Table of Contents

  1. Product
  2. Repository
  3. Instrument
  4. ObservatoryObservatories
  5. Persons

SPASE version 2.2.0

Numerical Data Product: Helios 2 E7 (Trainor) 30-min fluxes and rates

Resource ID
spase://VEPO/NumericalData/Helios2/E7/PT30M Get XML
Name
Helios 2 E7 (Trainor) 30-min fluxes and rates
Description

This data set, created in 2010 by Nand Lal, contains 30-min resolution fluxes and count rates of energetic protons, alpha particles, electrons and X-rays from the E7 experiment (P.I.: J. Trainor, GSFC) flown on the Helios 2 spacecraft. Accompanying each flux and count rate is a statistical uncertainty of the flux or rate. The data are spin-averaged. The data are in 1020-character ASCII records and consist of: A. Proton fluxes based on pulse height and rate data in 7 energy windows, 3.42-5.40, 6.40-11.95, 11.95-22.15, 24.59-28.74, 32.20-45.93, 45.93-57.56, 143.0-204.5 MeV. B. Alpha particle fluxes based on pulse heights and count rates in 6 energy windows, 3.24-4.78, 5.00-11.55, 11.55-21.76, 24.53-31.12, 31.35-45.63, 45.63-57.55 MeV/n. C. Combined proton plus alpha particle fluxes based on LET1 and HET count rates in 6 energy windows, 3-6, 6-11, 11-21, 20-30, 32-45, 45-56 MeV/n. D. Alpha particle fluxes based on HET count rates in three energy windows, 20-30, 32-45, 45-57 MeV/n. E. Two count rates primarily due to electrons at 2-4 and 4-8 MeV. F. 26 additional count rates corresponding to individual telescope sensors or sensor coincidences. For one sensor, rates at each of several discrimination levels are given). These rates are further discussed in the documentation and in the references provided. A subset of the above parameters (A, B, E) are available with graphical display at the OMNIWeb-Plus interface identified below

Additional information
Helios 2 E7 Readme

Listing of parameters in data records

Acknowledgement

The late Dr. James H. Trainor and Dr. Nand Lal

Contact
Role Person
1. Data producer Dr. Nand Lal Get XML
Release date
2011-03-17 00:00:00
Repository
Name
SPDF Get XML
Availability
Online
Access rights
Open
URL
Investigator site
OMNIWeb-Plus

Primary parameters of data product, with graphical display

Multi-Source Spectral Plot

Spectral plots and power law fits for arbitrary durations

Format
Text
Acknowledgement

The late Dr. James H. Trainor and Dr. Nand Lal, plus GSFC's Space Physics Data Facility

Processing level
Calibrated
Instrument
Galactic and Solar Cosmic Rays Get XML
Measurement type
Energetic particles
Temporal description
Start date
1976-01-19 00:00:00
Stop date
1979-12-23 00:00:00
Cadence
30 minutes
Observed regions
Heliosphere.Inner

Parameters

Parameter #1

Name
Proton fluxes and uncertainties
Parameter key
Column_2_through_Column_15
Description

Proton fluxes and associated statistical uncertainties for the seven energy ranges 3.42-5.40, 6.40-11.95, 11.95-22.15, 24.59-28.74, 32.20-45.93, 45.93-57.56, 143.0-204.5 MeV. The fluxes are obtained by combining pulse height and count rate data.

Cadence
30 minutes
Units
1/(cm**2 sec ster MeV)
Structure
Size
7 2
Description

Seven rows of pairs of proton flux and statistical uncertainty in the flux. The rows correspond to the seven energy ranges given above.

Particle type
Proton
Quantity
Number flux
Qualifier
Differential
Energy range
Low energy
3.42
High energy
204.5
Units
MeV

Parameter #2

Name
Alpha particle fluxes and uncertainties
Parameter key
Column_16_through_Column_27
Description

Alpha particle fluxes and associated statistical uncertainties for the six energy ranges 3.24-4.78, 5.00-11.55, 11.55-21.76, 24.53-31.12, 31.35-45.63, 45.63-57.55 MeV/n. The fluxes are obtained by combining pulse height and count rate data.

Cadence
30 minutes
Units
1/(cm**2 sec ster MeV/n)
Structure
Size
6 2
Description

Six rows of pairs of alpha particle flux and statistical uncertainty in the flux. The rows correspond to the six energy ranges given above.

Particle type
AlphaParticle
Quantity
Number flux
Qualifier
Differential
Energy range
Low energy
3.24
High energy
57.55
Units
MeV/n

Parameter #3

Name
Combined proton and alpha particle fluxes and uncertainties
Parameter key
Column_28_through_Column_39
Description

Fluxes for mixed protons and alpha particles, and associated statistical uncertainties, for the six energy ranges 3-6, 6-11, 11-21, 20-30, 32-45, 45-56 MeV/n. The fluxes are based on count rates only, without any pulse height analysis.

Cadence
30 minutes
Units
1/(cm**2 sec ster MeV/n)
Structure
Size
6 2
Description

Six rows of pairs of proton flux and statistical uncertainty in the flux. The rows correspond to the six energy ranges given above.

Particle type
Proton
AlphaParticle
Quantity
Number flux
Qualifier
Differential
Energy range
Low energy
3
High energy
56
Units
MeV/n

Parameter #4

Name
Alpha particle fluxes and uncertainties without PHA
Parameter key
Column_46_through_Column_51
Description

Fluxes of alpha particles and associated statistical uncertainties, for the three energy ranges 20-30, 32-45, 45-57 MeV/n. The fluxes are based on count rates only, without any pulse height analysis.

Cadence
30 minutes
Units
1/(cm**2 sec ster MeV/n)
Structure
Size
3 2
Description

Three rows of pairs of alpha particle flux and statistical uncertainty in the flux. The rows correspond to the three energy ranges given above.

Particle type
AlphaParticle
Quantity
Number flux
Qualifier
Differential
Energy range
Low energy
20
High energy
57
Units
MeV/n

Parameter #5

Name
Electron count rates and uncertainties
Parameter key
Column_94_through_Column_97
Description

Count rates primarily due to electrons, and associated statistical uncertainties, for the two energy ranges 2-4 and 4-8 MeV.

Cadence
30 minutes
Units
1/sec
Structure
Size
2 2
Description

Two rows of pairs of electron count rate and statistical uncertainty in the rate. The rows correspond to the 2-4 and 4-8 MeV energy ranges.

Particle type
Electron
Quantity
Count rate
Qualifier
Differential
Energy range
Low energy
2
High energy
8
Units
MeV

Parameter #6

Name
Miscellaneous additional count rates and uncertainties
Parameter key
Column_40_through_Column_101
Description

26 additional count rates corresponding to individual telescope sensors or sensor combinations. For one sensor, rates at each of several discrimination levels are given). These rates are further discussed in the documentation and in the references provided. They are not likely to be widely useful

Cadence
30 minutes
Units
1/sec
Structure
Size
26 2
Description

21 rows of pairs of various count rate and statistical uncertainty in the rate.

Particle type
Ion
Quantity
Count rate

SPASE version 2.2.0

Instrument: Galactic and Solar Cosmic Rays

Instrument ID
spase://SMWG/Instrument/Helios2/E7 Get XML
Name
Galactic and Solar Cosmic Rays
Description

The detector complement of this experiment (E7) consisted of three separate dE/dx vs E telescopes and a proportional counter for monitoring solar X rays in the range 2-8 keV. The high-energy telescope had a geometric factor of 0.22 sq cm-sr and measured electrons in three ranges between 2 and 8 MeV, and protons and alpha particles in three ranges between 20 and 56 MeV/n. Protons above 230 MeV were also measured. The first low-energy telescope (geometric factor was 0.155 sq cm-sr) measured protons and Z>1 particles in three ranges between 3 and 21 MeV/n. The second low-energy telescope (geometric factor was 0.015 sq cm-sr) measured protons in several ranges between 0.12 and 2.1 MeV, alpha particles in the ranges 0.6-2.1 and 6-21.2 MeV/n, and electrons in four ranges between 0.12 and 2 MeV. For a number of coincidence modes, counting-rate data sectored into eight 45-deg sectors were obtained. The data cycle time was dependent on the spacecraft telemetry rate (variable between 4096 and 8 bits/s) and format. Under optimum conditions, five events per second were pulse-height analyzed and the rate data cycle was of the order of 5 min. At the slowest combination of bit rate and format, a complete data cycle required about 2.5 h. See IEEE Trans. on Nuc. Sci., NS-22, p. 570, 1975, and Raumfahrtforschung, v. 19, n. 5, pp. 258-260, 1975, for further details.

Additional information
NSSDC's Master Catalog

Information about the Solar and Galactic Cosmic Ray experiment on the Helios-B mission.

Contact
Role Person
1. General contact Dr. Nand Lal Get XML
Release date
2011-05-05 20:50:16
Instrument type
Energetic Particle Instrument
Investigation name
Galactic and SolarCosmic Ray Experiment on Helios-B
Observatory
Helios 2 Get XML

SPASE version 2.2.0

Observatory: Helios 2

Observatory ID
spase://SMWG/Observatory/Helios2 Get XML
Name
Helios 2
Alternate name
Helios-B
Description

This spacecraft was one of a pair of deep-space probes developed by the Federal Republic of Germany (FRG) in a cooperative program with NASA. Experiments were provided by scientists from both FRG and the U.S. NASA supplied the Titan/Centaur launch vehicle. The spacecraft was equipped with two booms and a 32-m electric dipole. The payload consisted of a fluxgate magnetometer; electric and magnetic wave experiments, which covered various bands in the frequency range 6 Hz to 3 MHz; charged particle experiments, which covered various energy ranges starting with solar wind thermal energies and extending to 1 GeV; a zodiacal light experiment; and a micrometeoroid experiment. The purpose of the mission was to make pioneering measurements of the interplanetary medium from the vicinity of the earth's orbit to 0.3 AU. The spacecraft was spin stabilized with the spin axis normal to the ecliptic, and a nominal spin rate of 1 rps. The outer surface was coated with a conductive material, resulting in a plasma-sheath potential of typically 5 eV. Sheath-related coupling caused by the spacecraft antennae produced interference with the wave experiments, but the character of the interference was different from that observed on the Helios-A spacecraft. The spacecraft was capable of being operated at bit rates of from 4096 to 8 bps, variable by factors of two. While the spacecraft was moving to perihelion, it was generally operated from 64 to 256 bps; near 0.3 AU, it was operated at higher bit rates. Because of difficulty encountered with the high-gain antenna, and scheduling conflicts with Viking, relatively fewer high-bit-rate data were obtained from Helios-B than were available from Helios-A. Instrument descriptions written by the experiments are published (some in German, some in English) in the journal Raumfahrtforschung, v. 19, n. 5, 1975.

Additional information
NSSDC's Master Catalog

Information about the Helios-B mission

Contact
Role Person
1. Project scientist Dr. James H. Trainor Get XML
2. Project scientist Dr. Herbert Porsche Get XML
Release date
2010-10-01 20:45:03
Prior ID
spase://vspo/observatory/44
Observatory group
Helios Mission Get XML
Location
Region
Heliosphere.Inner

SPASE version 2.2.0

Observatory: Helios Mission

Observatory ID
spase://SMWG/Observatory/Helios Get XML
Name
Helios Mission
Description

A pair of deep space probes developed by the Federal Republic of Germany (FRG) in a cooperative program with NASA. Experiments were provided by scientists from both FRG and the U.S. NASA supplied the Titan/Centaur launch vehicle.

Contact
Role Person
1. Project scientist Dr. James H. Trainor Get XML
2. Project scientist Dr. Herbert Porsche Get XML
Release date
2010-10-01 20:44:34
Location
Region
Heliosphere.Inner

SPASE version 2.2.0

Person: Dr. Nand Lal

Name
Dr. Nand Lal
Organization
GSFC-Code 612.4
Person ID
spase://SMWG/Person/Nand.Lal Get XML

SPASE version 2.2.0

Person: Ms. Tamara J. Kovalick

Name
Ms. Tamara J. Kovalick
Organization
GSFC-Code 672
Email
Tamara.J.Kovalick@nasa.gov
Phone
+1-301-286-9422
Person ID
spase://SMWG/Person/Tamara.J.Kovalick Get XML
Release date
2010-08-05 17:35:47

SPASE version 2.2.0

Person: Mr. Robert M. Candey

Name
Mr. Robert M. Candey
Organization
NASA Goddard Space Flight Center
Address
Code 672, Greenbelt, MD 20771, USA
Email
robert.m.candey@nasa.gov
Phone
1-301-286-6707
Person ID
spase://SMWG/Person/Robert.M.Candey Get XML
Release date
2010-08-05 17:35:47

SPASE version 2.2.0

Person: Dr. Robert E. McGuire

Name
Dr. Robert E. McGuire
Organization
NASA Goddard Space Flight Center
Address
Code 672, Greenbelt, MD 20771, USA
Email
mcguire@mail630.gsfc.nasa.gov
Phone
+1 301 286 7794
Person ID
spase://SMWG/Person/Robert.E.McGuire Get XML
Release date
2010-08-05 17:35:47

SPASE version 2.2.0

Person: Dr. James H. Trainor

Name
Dr. James H. Trainor
Organization
Deceased - formerly at GSFC
Person ID
spase://SMWG/Person/James.H.Trainor Get XML
Release date
2010-08-05 17:35:46

SPASE version 2.2.0

Person: Dr. Herbert Porsche

Name
Dr. Herbert Porsche
Organization
DLR
Phone
+1-49-8153-28-505
Person ID
spase://SMWG/Person/Herbert.Porsche Get XML
Release date
2010-08-05 17:35:46

SPASE version 1.3.0

Repository: SPDF

Repository ID
spase://SMWG/Repository/NASA/GSFC/SPDF Get XML
Name
SPDF
Description

Space Physics Data Facility

Additional information
SPDF

Space Physics Data Facility

Contact
Role Person
1. General contact Ms. Tamara J. Kovalick Get XML
2. Technical contact Mr. Robert M. Candey Get XML
3. Project scientist Dr. Robert E. McGuire Get XML
Release date
2008-08-26 21:02:30
Prior IDs
spase://vspo/repository/61
spase://SMWG/Repository/SPDF
Access URL