Global structure of the heliosphere: Optical observations

Details Global structure of the heliosphere: Optical observations Global structure of the heliosphere: Optical observations

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..471..205l&link_type=abstract

The solar wind nine conference. AIP Conference Proceedings, Volume 471, pp. 205-210 (1999).

Astronomy and Astrophysics

Astronomy

11

Interplanetary Dust And Gas, Atomic, Molecular, And Chemical, And Grain Processes

Scientific paper

Optical observations of the interstellar gas in and around the heliosphere bring constraints on the heliospheric structure. I focus on two types of observations: -heliospheric H seen in emission: preliminary results of the SOHO/SWAN experiment, when compared with theoretical predictions, strongly favor a circumsolar electron density of the order of 0.04 cm-3. -heated heliospheric H from the interface seen in absorption: I show some recent developments on the detection of neutral H from our heliosphere through its absorption lines in nearby star spectra. The same spectra also show absorption lines due to heated H around the stars themselves (the astrospheres).

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