|
gptkbp:instance_of
|
gptkb:satellite
|
|
gptkbp:bfsLayer
|
4
|
|
gptkbp:bfsParent
|
gptkb:Explorer_1
|
|
gptkbp:analysis
|
ongoing
|
|
gptkbp:application
|
gptkb:spacecraft
ongoing efforts
|
|
gptkbp:collaborations
|
gptkb:University_of_California
gptkb:battle
universities
|
|
gptkbp:collection
|
remote sensing
magnetic field data
|
|
gptkbp:communication
|
radio signals
|
|
gptkbp:community
|
NASA scientists
|
|
gptkbp:contribution
|
magnetosphere studies
|
|
gptkbp:data_type
|
digital
scientific data
|
|
gptkbp:data_usage
|
gptkb:academic_research
various fields
10 M Hz
|
|
gptkbp:decommissioned
|
1967-12-31
|
|
gptkbp:historical_context
|
gptkb:launch_complex
|
|
gptkbp:historical_significance
|
current research
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Explorer 21
|
|
gptkbp:impact
|
gptkb:significant
high
|
|
gptkbp:innovation
|
new technologies
|
|
gptkbp:instrument
|
gptkb:video_game
fluxgate magnetometer
|
|
gptkbp:is_considered
|
peer-reviewed
|
|
gptkbp:launch_date
|
gptkb:1965
1965-02-25
|
|
gptkbp:launch_site
|
gptkb:cape
|
|
gptkbp:launch_vehicle
|
150 kg
Delta D
|
|
gptkbp:legacy
|
contributed to understanding of magnetosphere
|
|
gptkbp:manufacturer
|
gptkb:NASA
|
|
gptkbp:mass
|
150 kg
|
|
gptkbp:mission
|
gptkb:1967
gptkb:Research_Institute
Earth science
successful
technical issues
NASA archives
low Earth orbit
successful mission review
planned decommissioning
important for space science
|
|
gptkbp:mission_duration
|
2 years
|
|
gptkbp:notable_work
|
magnetic field variations
|
|
gptkbp:objective
|
study Earth's magnetosphere
|
|
gptkbp:operational_area
|
2 years
|
|
gptkbp:operational_status
|
decommissioned
|
|
gptkbp:orbital_inclination
|
30 degrees
|
|
gptkbp:orbital_period
|
gptkb:battle
90 minutes
|
|
gptkbp:partnerships
|
gptkb:international_partners
|
|
gptkbp:power_output
|
solar panels
|
|
gptkbp:products
|
high
|
|
gptkbp:provides_information_on
|
public access
open access
|
|
gptkbp:publishes
|
gptkb:academic_journal
|
|
gptkbp:receives_funding_from
|
NASA budget
|
|
gptkbp:reign_end
|
90 minutes
|
|
gptkbp:research
|
empirical research
enhanced understanding of space environment
|
|
gptkbp:research_focus
|
gptkb:space_weather
|
|
gptkbp:scientific_goals
|
measure magnetic fields
|
|
gptkbp:status
|
re-entered atmosphere
|
|
gptkbp:storage
|
onboard memory
|
|
gptkbp:student_enrollment
|
long-term
|
|
gptkbp:successor
|
gptkb:Explorer_22
|