Columbia subject headings:
Astronautics in astronomy--Congresses.
Orbiting solar observatories--Congresses.
Solar activity--Measurement--Congresses.
Sun--Observations--Congresses.
Harvard subject headings:
Astronautics in astronomy--Congresses
Orbiting solar observatories--Congresses.
Solar activity--Measurement--Congresses.
Sun--Observations--Congresses.
Princeton subject headings:
Astronautics in astronomy--Congresses.
Orbiting solar observatories--Congresses.
Solar activity--Measurement--Congresses.
Sun--Observations--Congresses.