International Satellites for Ionospheric Studies 

This directory groups data from the ISIS 1 and 2 satellites. 

Subdirectories:
/cylindrical_electrostatic_probes_ascii   
	Electron density and temperature from the Cylindrical Electrostatic 
	Probe (CEP) in ASCII format from ISIS 1 and 2. 		
/cylindrical_electrostatic_probes_binary
	Orignal CEP data in binary format.
/energetic_particle_detectors_binary
	Electron and proton data from the energetic particle detector on ISIS-1
	and ISIS 2 in binary format.   
/ion_mass_spectrometer_ascii_binary
	Ion densities from the ion mass spectrometer (IMS) on ISIS-2 in ASCII
	and binary format.
/ion_mass_spectrometer_original-binary
	The original IMS data from ISIS-2 in binary format.
/retarding_potential_analyzer_binary
	Ion and electron densities and temperatures from the retarding potential 
	analyzer on ISIS-2 in the original binary format.
/spherical_electrostatic_analyzer_binary   
	Ion and electron densities and temperatures from the spherical electro-
	static analyzer on ISIS-2 in the original binary format.
/topside_sounder    
	Ionograms (binary, CDF, JPG, PNG) and electron density profiles (ASCII) 
	from the topside sounder insturments.
					
Additional related information and data services on the ISIS data restoration
home page: <http://spdf.gsfc.nasa.gov/isis/isis-status.html>

Please acknowledge the NASA Space Physics Data Facility and the instrument's Principal
Investigator for any data usage.

Keywords: ionosphere, topside, ISIS, ionogram, electron density

Data contact: Dieter.Bilitza-1@nasa.gov>
NASA Official: Dr. Robert McGuire <robert.e.mcguire@nasa.gov>